The Festoon Objective |
The Festoon Objective |
Jan 20 2006, 02:10 PM
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#1
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Member Group: Members Posts: 100 Joined: 20-January 06 Member No.: 652 |
Oppy has moved in to position to examine the festoon cross beds.
http://qt.exploratorium.edu/mars/opportuni...KSP1214L0M1.JPG -------------------- |
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Jan 28 2006, 10:14 PM
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#2
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Solar System Cartographer Group: Members Posts: 10226 Joined: 5-April 05 From: Canada Member No.: 227 |
I'm not convinced by the cross-bedding interpretation, never have been. The only think I ever thought looked like it was the 'unconformity' in Endurance. Maybe aeolian cross-bedding cemented by minerals precipitated out of ground water. This - for the most part it looks like parallel bedding exposed on an irregular surface.
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 29 2006, 12:04 AM
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#3
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Senior Member Group: Members Posts: 2488 Joined: 17-April 05 From: Glasgow, Scotland, UK Member No.: 239 |
QUOTE (Phil Stooke @ Jan 28 2006, 11:14 PM) I'm not convinced by the cross-bedding interpretation, never have been. The only think I ever thought looked like it was the 'unconformity' in Endurance. Maybe aeolian cross-bedding cemented by minerals precipitated out of ground water. This - for the most part it looks like parallel bedding exposed on an irregular surface. Phil Phil: I don't see it either. It looked as much about erosion as anything... ...still, worth a look - though perhaps not so much as a look as it has had! Bob Shaw -------------------- Remember: Time Flies like the wind - but Fruit Flies like bananas!
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Jan 29 2006, 06:02 PM
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#4
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Junior Member Group: Members Posts: 71 Joined: 11-May 05 From: Colorado USA Member No.: 386 |
QUOTE (Bob Shaw @ Jan 28 2006, 06:04 PM) Phil: I don't see it either. It looked as much about erosion as anything... ...still, worth a look - though perhaps not so much as a look as it has had! Bob Shaw Yep. The erosion is preferential along cracks which cause angular points in the bedding. Reminds me of topographic maps of the southwest: eroded canyons with the contour lines (which are by definition parallel to each other) creating points and waves and T-shapes against the canyon floor. You really have to look at the rocks from the side to see if any of the beds bend up to form little hats. Scott |
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