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		<id>https://www.explainxkcd.com/wiki/index.php?action=history&amp;feed=atom&amp;title=3162%3A_Heart_Mountain</id>
		<title>3162: Heart Mountain - Revision history</title>
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		<updated>2026-04-24T12:52:45Z</updated>
		<subtitle>Revision history for this page on the wiki</subtitle>
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	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=409937&amp;oldid=prev</id>
		<title>162.218.182.25: /* Explanation */ caps</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=409937&amp;oldid=prev"/>
				<updated>2026-04-08T20:04:12Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; caps&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 20:04, 8 April 2026&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l12&quot; &gt;Line 12:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 12:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[File:Heart_Mountain_WY.jpg|thumb|Heart Mountain]]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;[[File:Heart_Mountain_WY.jpg|thumb|Heart Mountain]]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Pyramidology&lt;/del&gt;}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the [[3210:_Eliminating_the_Impossible|seemingly absurd remain]].&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;pyramidology&lt;/ins&gt;}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the [[3210:_Eliminating_the_Impossible|seemingly absurd remain]].&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that sometime 48-50 million years ago (most likely 48.9 Mya) a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the contribution of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that sometime 48-50 million years ago (most likely 48.9 Mya) a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the contribution of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>162.218.182.25</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=408511&amp;oldid=prev</id>
		<title>2603:800C:1200:596A:71BB:892F:DE6B:E88C: /* Explanation */ photo</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=408511&amp;oldid=prev"/>
				<updated>2026-03-19T20:10:12Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; photo&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
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				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 20:10, 19 March 2026&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l10&quot; &gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[File:Heart_Mountain_WY.jpg|thumb|Heart Mountain]]&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the [[3210:_Eliminating_the_Impossible|seemingly absurd remain]].&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the [[3210:_Eliminating_the_Impossible|seemingly absurd remain]].&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>2603:800C:1200:596A:71BB:892F:DE6B:E88C</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=408454&amp;oldid=prev</id>
		<title>Mtcv: /* Explanation */ link to 3210 for the sherlock reference</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=408454&amp;oldid=prev"/>
				<updated>2026-03-19T07:38:39Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; link to 3210 for the sherlock reference&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 07:38, 19 March 2026&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l11&quot; &gt;Line 11:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 11:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;[[3210:_Eliminating_the_Impossible|&lt;/ins&gt;seemingly absurd remain&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;]]&lt;/ins&gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that sometime 48-50 million years ago (most likely 48.9 Mya) a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the contribution of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that sometime 48-50 million years ago (most likely 48.9 Mya) a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the contribution of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>Mtcv</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=398916&amp;oldid=prev</id>
		<title>216.221.83.168: I think we have all we need; in the absence of further discussion or edits, I am removing the incomplete tag (Despite the joke being really funny! You guys are awesome.)</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=398916&amp;oldid=prev"/>
				<updated>2025-12-04T15:56:23Z</updated>
		
		<summary type="html">&lt;p&gt;I think we have all we need; in the absence of further discussion or edits, I am removing the incomplete tag (Despite the joke being really funny! You guys are awesome.)&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 15:56, 4 December 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l10&quot; &gt;Line 10:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 10:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;{{incomplete|This page was created by a GIANT SLIDING ROBOT. Don't remove this notice too soon.}}&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>216.221.83.168</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390820&amp;oldid=prev</id>
		<title>TheErgster: Removed &quot;incomplete transcript&quot; tag as transcript was complete</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390820&amp;oldid=prev"/>
				<updated>2025-11-13T14:47:34Z</updated>
		
		<summary type="html">&lt;p&gt;Removed &amp;quot;incomplete transcript&amp;quot; tag as transcript was complete&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 14:47, 13 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l20&quot; &gt;Line 20:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 20:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Transcript==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;{{incomplete transcript|Don't remove this notice too soon.}}&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:[Cueball is on the left, Ponytail is facing him from the right.]&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;:[Cueball is on the left, Ponytail is facing him from the right.]&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>TheErgster</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390344&amp;oldid=prev</id>
		<title>216.221.83.168: /* Explanation */ Removed unnessary detail, subjective comments, and speculation.</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390344&amp;oldid=prev"/>
				<updated>2025-11-06T18:54:34Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; Removed unnessary detail, subjective comments, and speculation.&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 18:54, 6 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l15&quot; &gt;Line 15:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 15:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that sometime 48-50 million years ago (most likely 48.9 Mya) a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the contribution of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that sometime 48-50 million years ago (most likely 48.9 Mya) a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the contribution of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;While the comic implies the mountain by itself levitating on volcanic gasses as it moved across the ground, Heart Mountain is in reality &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;'just' &lt;/del&gt;a remnant closer to the leading edge of a massive landslide (the Heart Mountain Detachment) that covered several thousand square kilometers of the Absaroka basin. &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;The landslide &lt;/del&gt;would &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;probably &lt;/del&gt;have &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;looked no different than a regular landslide (albeit much larger)&lt;/del&gt;, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;not like a &amp;quot;hovercraft&amp;quot; floating over the ground{{Citation needed}}.&amp;#160; In this regard, this landslide is not significantly different than other major landslides such as the {{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}}&lt;/del&gt;. &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Instead, the main uniqueness to this landslide is the mechanism&lt;/del&gt;, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;where volcanic activity may have produced gasses or liquids that initiated and or &amp;quot;lubricated&amp;quot; the slope &lt;/del&gt;the &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;landslide moved down, resulting in a rare example of a megaslide happening on land.{{Actual citation needed}}&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;While the comic implies the mountain by itself levitating on volcanic gasses as it moved across the ground, Heart Mountain is in reality a remnant closer to the leading edge of a massive landslide (the Heart Mountain Detachment) that covered several thousand square kilometers of the Absaroka basin. &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;It &lt;/ins&gt;would have &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;accompanied and been partially or fully buried by other&lt;/ins&gt;, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;looser debris before being uncovered by erosion&lt;/ins&gt;. &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;However&lt;/ins&gt;, the remainder of the landslide debris over younger rocks &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;either did not remain upright during the landslide or &lt;/ins&gt;has &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;been &lt;/ins&gt;eroded &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;away&lt;/ins&gt;. Many of the other &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;remaining upright formations &lt;/ins&gt;did not slide nearly so far, still remaining above older rock formations. Therefore, Heart Mountain remains as the main rock formation with the anomalous inverted stratigraphy caused by the landslide.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;The &lt;/del&gt;remainder of the landslide debris over younger rocks &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;was likely looser conglomerate that &lt;/del&gt;has &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;since &lt;/del&gt;eroded &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;beyond easy recognition. A few other farther-travelling remnants are at McCullough Peaks and potentially {{w|Piestewa Peak}}&lt;/del&gt;. Many of the other &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;larger pieces &lt;/del&gt;did not slide nearly so far, still remaining above older rock formations. Therefore, Heart Mountain remains as the main rock formation with the anomalous inverted stratigraphy caused by the landslide.&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>216.221.83.168</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390343&amp;oldid=prev</id>
		<title>216.221.83.168: /* Explanation */ Updating date and wording. Reworked geologic background with more clarifications.</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390343&amp;oldid=prev"/>
				<updated>2025-11-06T18:48:16Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; Updating date and wording. Reworked geologic background with more clarifications.&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 18:48, 6 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l13&quot; &gt;Line 13:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 13:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that 50&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;-75 &lt;/del&gt;million years ago a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;action &lt;/del&gt;of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;sometime 48-&lt;/ins&gt;50 million years ago &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;(most likely 48.9 Mya) &lt;/ins&gt;a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;contribution &lt;/ins&gt;of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;While the comic implies the mountain by itself levitating on volcanic gasses as it moved across the ground, Heart Mountain is in reality 'just' a remnant of a massive landslide that covered several thousand square kilometers of the Absaroka basin. &lt;del class=&quot;diffchange diffchange-inline&quot;&gt; The remainder of the landslide eroded away over tens of millions of years, leaving Heart Mountain as the main anomaly.&amp;#160; &lt;/del&gt;The landslide would probably have looked no different than a regular landslide (albeit much larger), not like a &amp;quot;hovercraft&amp;quot; floating over the ground&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;.&lt;/del&gt;{{Citation needed}}&amp;#160; In this regard, this landslide is not significantly different than other major landslides such as the {{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}}. Instead, the main uniqueness to this landslide is the mechanism, where volcanic activity may have produced gasses or liquids that initiated and or &amp;quot;lubricated&amp;quot; the slope the landslide moved down, resulting in a rare example of a megaslide happening on land.{{Actual citation needed}}&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;While the comic implies the mountain by itself levitating on volcanic gasses as it moved across the ground, Heart Mountain is in reality 'just' a remnant &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;closer to the leading edge &lt;/ins&gt;of a massive landslide &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;(the Heart Mountain Detachment) &lt;/ins&gt;that covered several thousand square kilometers of the Absaroka basin. The landslide would probably have looked no different than a regular landslide (albeit much larger), not like a &amp;quot;hovercraft&amp;quot; floating over the ground{{Citation needed}}&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;. &lt;/ins&gt; In this regard, this landslide is not significantly different than other major landslides such as the {{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}}. Instead, the main uniqueness to this landslide is the mechanism, where volcanic activity may have produced gasses or liquids that initiated and or &amp;quot;lubricated&amp;quot; the slope the landslide moved down, resulting in a rare example of a megaslide happening on land.{{Actual citation needed}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;The remainder of the landslide debris over younger rocks was likely looser conglomerate that has since eroded beyond easy recognition. A few other farther-travelling remnants are at McCullough Peaks and potentially {{w|Piestewa Peak}}. Many of the other larger pieces did not slide nearly so far, still remaining above older rock formations. Therefore, Heart Mountain remains as the main rock formation with the anomalous inverted stratigraphy caused by the landslide.&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>216.221.83.168</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390227&amp;oldid=prev</id>
		<title>82.132.246.131: /* Explanation */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390227&amp;oldid=prev"/>
				<updated>2025-11-05T17:54:15Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 17:54, 5 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l15&quot; &gt;Line 15:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 15:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that 50-75 million years ago a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the action of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that 50-75 million years ago a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the action of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;While the comic implies the mountain by itself levitating on volcanic gasses as it moved across the ground, Heart Mountain is in reality 'just' a remnant of a massive landslide that covered several thousand square kilometers of the Absaroka basin.&amp;#160; The remainder of the landslide eroded away over tens of millions of years, leaving Heart Mountain as the main anomaly.&amp;#160; The landslide would probably have looked no different &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;that &lt;/del&gt;a regular landslide (albeit much larger), not like a &amp;quot;hovercraft&amp;quot; floating over the ground.{{Citation needed}}&amp;#160; In this regard, this landslide is not significantly different than other major landslides such as the {{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}}. Instead, the main uniqueness to this landslide is the mechanism, where volcanic activity may have produced gasses or liquids that initiated and or &amp;quot;lubricated&amp;quot; the slope the landslide moved down, resulting in a rare example of a megaslide happening on land.{{Actual citation needed}}&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;While the comic implies the mountain by itself levitating on volcanic gasses as it moved across the ground, Heart Mountain is in reality 'just' a remnant of a massive landslide that covered several thousand square kilometers of the Absaroka basin.&amp;#160; The remainder of the landslide eroded away over tens of millions of years, leaving Heart Mountain as the main anomaly.&amp;#160; The landslide would probably have looked no different &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;than &lt;/ins&gt;a regular landslide (albeit much larger), not like a &amp;quot;hovercraft&amp;quot; floating over the ground.{{Citation needed}}&amp;#160; In this regard, this landslide is not significantly different than other major landslides such as the {{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}}. Instead, the main uniqueness to this landslide is the mechanism, where volcanic activity may have produced gasses or liquids that initiated and or &amp;quot;lubricated&amp;quot; the slope the landslide moved down, resulting in a rare example of a megaslide happening on land.{{Actual citation needed}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>82.132.246.131</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390219&amp;oldid=prev</id>
		<title>216.221.83.168: /* Explanation */ Combined the explainations and combined the comic description up top.</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390219&amp;oldid=prev"/>
				<updated>2025-11-05T15:51:41Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation: &lt;/span&gt; Combined the explainations and combined the comic description up top.&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 15:51, 5 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l11&quot; &gt;Line 11:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 11:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;==Explanation==&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{incomplete|This page was created by a GIANT SLIDING ROBOT. Don't remove this notice too soon.}}&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;{{incomplete|This page was created by a GIANT SLIDING ROBOT. Don't remove this notice too soon.}}&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The structure of the {{w|Heart Mountain (Wyoming)#Geology|geology of Heart Mountain}}, in Wyoming, is a geological anomaly whose current best scientific explanation is highly unusual&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;. This is humorously summarized as, &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot;, with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are not doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain&lt;/ins&gt;.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that 50-75 million years ago a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the action of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;, after which significant erosion over millions of years has removed much (but not all) of the material that would give the original context&lt;/del&gt;. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;The main anomaly is that the rock at the top of the mountain is far older than that of its base. There are {{w|Nappe|other processes}} that can result in such {{w|inverted stratigraphy}}, but in this case the evidence does indeed seem to suggest that 50-75 million years ago a massive landslide was rapidly (in parts at the quoted speed of 90 mph (145&amp;amp;nbsp;km/h), or more, lasting perhaps just ''half an hour'') forced to slide a significant distance over younger rocks, through the action of one or other volcanic processes on and above a near-horizontal {{w|Fault (geology)|geological fault}}. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;This is humorously summarized as &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot; with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain.&lt;/del&gt;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;While &lt;/ins&gt;the comic implies the mountain by itself levitating on volcanic gasses as it moved across the ground, Heart Mountain is &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;in reality '&lt;/ins&gt;just&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;' &lt;/ins&gt;a &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;remnant &lt;/ins&gt;of a massive landslide that covered several thousand square kilometers of the Absaroka basin.&amp;#160; The remainder of the landslide eroded away over tens of millions of years, leaving Heart Mountain &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;as the main anomaly&lt;/ins&gt;.&amp;#160; &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;The &lt;/ins&gt;landslide would probably have looked no different that a regular landslide (albeit much larger)&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;, &lt;/ins&gt;not like a &amp;quot;hovercraft&amp;quot; floating over the ground.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;{{Citation needed}} &lt;/ins&gt; &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;In &lt;/ins&gt;this regard&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;, this landslide &lt;/ins&gt;is not significantly different than other major landslides such as the {{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}}&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;. Instead, the main uniqueness to this landslide is &lt;/ins&gt;the &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;mechanism, where volcanic activity may have produced gasses or liquids &lt;/ins&gt;that &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;initiated and or &amp;quot;lubricated&amp;quot; the slope the landslide moved down&lt;/ins&gt;, &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;resulting in a rare example of a megaslide happening &lt;/ins&gt;on land.&lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;{{Actual citation needed}}&lt;/ins&gt;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del class=&quot;diffchange diffchange-inline&quot;&gt;Note that while &lt;/del&gt;the comic implies the mountain by itself &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;almost &lt;/del&gt;levitating on volcanic gasses as it moved across the ground, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;in reality &lt;/del&gt;Heart Mountain is just a &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;remanent &lt;/del&gt;of a massive landslide that covered several thousand square kilometers of the Absaroka basin.&amp;#160; The remainder of the landslide eroded away over tens of millions of years, leaving Heart Mountain.&amp;#160; &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;While volcanic activity may have produced gasses or liquids that initiated and or &amp;quot;lubricated&amp;quot; the slope the landslide moved down, the &lt;/del&gt;landslide would probably have looked no different that a regular landslide (albeit much larger) not like a &amp;quot;hovercraft&amp;quot; floating over the ground.&amp;#160; &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;The Heart Mountain landslide in &lt;/del&gt;this regard is not significantly different than other major landslides such as the {{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}} &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;with &lt;/del&gt;the &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;difference &lt;/del&gt;that &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;most such megaslides occur underwater&lt;/del&gt;, &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;while the one that created Heart Mountain occurred &lt;/del&gt;on land. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td colspan=&quot;2&quot;&gt;&amp;#160;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>216.221.83.168</name></author>	</entry>

	<entry>
		<id>https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390137&amp;oldid=prev</id>
		<title>216.9.105.210: /* Explanation */</title>
		<link rel="alternate" type="text/html" href="https://www.explainxkcd.com/wiki/index.php?title=3162:_Heart_Mountain&amp;diff=390137&amp;oldid=prev"/>
				<updated>2025-11-04T20:26:42Z</updated>
		
		<summary type="html">&lt;p&gt;‎&lt;span dir=&quot;auto&quot;&gt;&lt;span class=&quot;autocomment&quot;&gt;Explanation&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
&lt;table class=&quot;diff diff-contentalign-left&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr style=&quot;vertical-align: top;&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: white; color:black; text-align: center;&quot;&gt;Revision as of 20:26, 4 November 2025&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l17&quot; &gt;Line 17:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 17:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;This is humorously summarized as &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot; with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;This is humorously summarized as &amp;quot;49 million years ago, Heart Mountain, Wyoming slid sideways 15 miles like a giant stone hovercraft&amp;quot; with a similarly oversimplified functional diagram. Those not following the evidence that leads to this unusual conclusion may decide those involved do not have a normal state of mind ('are doing ok'), and potentially sliding into pseudoscience like that of {{w|Pyramidology}}. The geologists acknowledge this, but ask, &amp;quot;Hey, you come up with a better explanation!&amp;quot; - as all more 'reasonable' explanations have been eliminated, and only the seemingly absurd remain.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;−&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Note that while the comic implies the mountain &lt;del class=&quot;diffchange diffchange-inline&quot;&gt;alone &lt;/del&gt;almost levitating on volcanic gasses as it moved across the ground, in reality Heart Mountain is just a remanent of a massive landslide that covered several thousand square kilometers of the Absaroka basin.&amp;#160; The remainder of the landslide eroded away over tens of millions of years, leaving Heart Mountain.&amp;#160; While volcanic activity may have produced gasses or liquids that initiated and or &amp;quot;lubricated&amp;quot; the slope the landslide moved down, the landslide would probably have looked no different that a regular landslide (albeit much larger) not like a &amp;quot;hovercraft&amp;quot; floating over the ground.&amp;#160; The Heart Mountain landslide in this regard is not significantly different than other major landslides such as {{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}} with the difference that most such megaslides occur underwater, while the one that created Heart Mountain occurred on land. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;+&lt;/td&gt;&lt;td style=&quot;color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;Note that while the comic implies the mountain &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;by itself &lt;/ins&gt;almost levitating on volcanic gasses as it moved across the ground, in reality Heart Mountain is just a remanent of a massive landslide that covered several thousand square kilometers of the Absaroka basin.&amp;#160; The remainder of the landslide eroded away over tens of millions of years, leaving Heart Mountain.&amp;#160; While volcanic activity may have produced gasses or liquids that initiated and or &amp;quot;lubricated&amp;quot; the slope the landslide moved down, the landslide would probably have looked no different that a regular landslide (albeit much larger) not like a &amp;quot;hovercraft&amp;quot; floating over the ground.&amp;#160; The Heart Mountain landslide in this regard is not significantly different than other major landslides such as &lt;ins class=&quot;diffchange diffchange-inline&quot;&gt;the &lt;/ins&gt;{{w|Storegga Slide}} or the {{w|Nuʻuanu Slide}} with the difference that most such megaslides occur underwater, while the one that created Heart Mountain occurred on land. &amp;#160;&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;td class='diff-marker'&gt;&amp;#160;&lt;/td&gt;&lt;td style=&quot;background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;!-- Maybe better reinserted, after the Transcript, as ==Trivia==? --&amp;gt;As an added bonus, the first 'European&amp;lt;!-- as distinct from anything that precolumbian natives might ever have already had, non-orally, hence feeling the necessity to have scare-quotes --&amp;gt;' maps of the mountain also {{w|Heart Mountain (Wyoming)#Hart Mountain|may have placed it}} in the wrong position, but this was purely human error and totally unconnected to the prehistoric rearrangement of material.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>216.9.105.210</name></author>	</entry>

	</feed>