To the Cape! (part 2), For real this time! |
To the Cape! (part 2), For real this time! |
Jun 13 2008, 08:10 AM
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#1
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Senior Member Group: Moderator Posts: 4279 Joined: 19-April 05 From: .br at .es Member No.: 253 |
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Jun 28 2008, 02:16 PM
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#2
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Senior Member Group: Members Posts: 3009 Joined: 30-October 04 Member No.: 105 |
Agreed, but I've not been able to wrap my brain around a plausible mechanism to explain the "scalloped" rim around Victoria (et al). With a couple of prevailing wind directions, there shouldn't be such symmetry in the scallops. I'm sure that the explanation is as simple as the ones covering stream meanders or salients and recesses, but I've not stumbled upon it.
--Bill -------------------- |
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Jun 29 2008, 10:24 PM
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#3
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Senior Member Group: Moderator Posts: 2785 Joined: 10-November 06 From: Pasadena, CA Member No.: 1345 |
Agreed, but I've not been able to wrap my brain around a plausible mechanism to explain the "scalloped" rim around Victoria (et al). From the abstract of a recent article discussing Victoria crater (see Nature of Victoria's Dark Streaks thread, post 430): "...sand [in Victoria Crater] is supplied from outside the crater and is presently escaping it's topographic trap. This process presents a possible explanation for the serrated margin of Victoria crater, through abrasion of the soft rock as trapped sands are blown out of the crater and carve alcoves under various seasonal winds." What causes the regular spacing of the scallops? Good question. It could be from radial fractures from the crater formation (as centsworth II suggested), or it could be initiated from subtle turbulence effects as sand carrying winds swirl around the interior rim of the crater. It'd be neat to watch it evolve over time (a geologically long time, I reckon). -Mike -------------------- Some higher resolution images available at my photostream: http://www.flickr.com/photos/31678681@N07/
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