Concepción, The freshest crater yet to be explored |
Concepción, The freshest crater yet to be explored |
Jan 27 2010, 03:48 AM
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Senior Member Group: Members Posts: 4256 Joined: 17-January 05 Member No.: 152 |
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Jan 27 2010, 07:09 PM
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
Many, maybe most of the rocks seem to be sitting on the drifts - very few seem embedded. And there's no sign I can see yet of wind tails behind rocks or moat-like troughs wrapping around the base of rocks (compare with the Barnacle Bill area at Pathfinder to see what I'm referring to). I take that to mean that the drifts have hardly changed since the crater formed. If the drifts were marching across the surface, even 1 cm per year, I would expect to see more buried rocks or wind sculpting of drift around rocks. Pancams might prove me wrong. But I think this shows the big drifts are fairly static on thousand year time scales.
Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PDF: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Jan 27 2010, 08:00 PM
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Senior Member Group: Admin Posts: 4763 Joined: 15-March 05 From: Glendale, AZ Member No.: 197 |
... I think this shows the big drifts are fairly static on thousand year time scales. ...or that the crater is less than 1000 years old. It's all relative and I have yet to see any data that pins any of the relationships down to an absolute. -------------------- If Occam had heard my theory, things would be very different now.
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Jan 27 2010, 09:30 PM
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Senior Member Group: Moderator Posts: 3241 Joined: 11-February 04 From: Tucson, AZ Member No.: 23 |
What data could Opportunity collect that might help pin the age down? I take it radioisotope ratios are out
-------------------- &@^^!% Jim! I'm a geologist, not a physicist!
The Gish Bar Times - A Blog all about Jupiter's Moon Io |
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