https://www2.lpod.org/index.php?title=August_30,_2020&feed=atom&action=historyAugust 30, 2020 - Revision history2024-03-28T21:17:18ZRevision history for this page on the wikiMediaWiki 1.31.1https://www2.lpod.org/index.php?title=August_30,_2020&diff=45371&oldid=prevApi: Created page with "__NOTOC__ =A Hill of Speculations= Originally published March 16, 2011 <!-- Start of content --> <!-- ws:start:WikiTextHeadingRule:0:<h1> --> <!-- ws:start:WikiText..."2020-08-30T08:05:02Z<p>Created page with "__NOTOC__ =A Hill of Speculations= Originally published March 16, 2011 <!-- Start of content --> <!-- ws:start:WikiTextHeadingRule:0:<h1> --> <!-- ws:start:WikiText..."</p>
<p><b>New page</b></p><div>__NOTOC__<br />
=A Hill of Speculations=<br />
Originally published March 16, 2011<br />
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<em>image by [mailto:hill@lpl.arizona.edu Richard Hill], Tucson, Arizona</em><br /><br />
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Imagine a time, perhaps 3.5 billion years ago, long before Aristarchus formed, when Herodotus was a deep crater with <br />
terraces and central peak. When it, in fact, looked just like Aristarchus. What happened to it? Its smooth skating rink <br />
floor shows that lava has filled in the depths, covering the central mountain and terraces. Because the rim of Herodotus<br />
is unbroken, the lava must have risen up fractures, as at Plato and Archimedes. Perhaps the lava came from the same<br />
source that fed Schröter's Valley and bleed out to make the surrounding mare. But Herodotus formed by impact into the <br />
Aristarchus Plateau so the crater must have been formed nearer the end of the volcanic activity that formed the Plateau.<br />
In false color images Herodotus is [http://photojournal.jpl.nasa.gov/catalog/pia00090 veneered] by pyroclastics from the Valley - that eruption must have been subsequent<br />
to the lava-filling of Herodtus. So we've built a stratigraphy of sorts but still don't know why and exactly when Herodotus<br />
was flooded. On a different note, it is remarkable that two large craters formed near the south edge of the Plateau. <br />
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<em>[mailto:tychocrater@yahoo.com Chuck Wood]</em><br /><br />
There is another piece of stratigraphy that constrains the time of formation of Herodotus - do you recognize it?<br /><br />
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<strong>Related Links</strong><br /><br />
Rükl plate [https://the-moon.us/wiki/R%C3%BCkl_18 18]<br /><br />
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<p><b>Yesterday's LPOD:</b> [[August 29, 2020|Tiara of Lights]] </p><br />
<p><b>Tomorrow's LPOD:</b> [[August 31, 2020|What is Hidden Below the Surface?]] </p><br />
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