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To the Cape! (part 2), For real this time!
Tesheiner
post Jun 13 2008, 08:10 AM
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This is a navcam mosaic taken after driving during sol 1559.
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Mmm, remember the name of this thread?
To the Cape! Yeah! biggrin.gif
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Shaka
post Jun 28 2008, 05:55 AM
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Ultimately, these questions all hearken back to the formation of the cape-and-bay crater rim. Why are the bays eroded down the strata at a 20 - 30 degree angle, while the capes are cut down more or less vertically. I can't believe that this is due to a more resistant sediment formation in the capes, neatly interspersed with less resistant strata in the bays. Until somebody lays out a plausible hypothesis for the formation of Victoria's sinuous rim, I don't think this little microcosmic curiosity at the base of one cape can be understood.


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My Grandpa goes to Mars every day and all I get are these lousy T-shirts!
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ElkGroveDan
post Jun 28 2008, 07:31 AM
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QUOTE (Shaka @ Jun 27 2008, 09:55 PM) *
Why are the bays eroded down the strata at a 20 - 30 degree angle, while the capes are cut down more or less vertically.


Primarily: Capes have greater exposure to the prominent erosion forces - prevailing winds. As a result they are in a less stable vertical condition. The bays are set back and more sheltered from the prevailing winds so they are older and have had time to slump. As an example go dig some holes in your yard, one each month. After a year see what the sides of the holes are like. The newest holes will have the steepest sides, the older holes will have slumped in on themselves.

Secondarily: The capes by virtue of their recessed shape are traps for the heavier particles that the winds are unable to lift from the crater.

This back and forth of capes and bays likely occurs in a manner analogous to a meandering stream. Over the eons the shapes will migrate back and forth as bays fill up and capes are eroded away...and the crater grows ever larger (assuming some external condition doesn't cause it to become filled in by migrating sand dunes or such.)


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PaulM
post Jun 28 2008, 08:21 AM
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QUOTE (ElkGroveDan @ Jun 28 2008, 08:31 AM) *
This back and forth of capes and bays likely occurs in a manner analogous to a meandering stream. Over the eons the shapes will migrate back and forth as bays fill up and capes are eroded away...and the crater grows ever larger (assuming some external condition doesn't cause it to become filled in by migrating sand dunes or such.)


The problem with this argument if I understand it correctly is that the capes consist of ancient undisturbed strata and not the recent deposits you would see on the bank of a river. I think that the argument only works if Victoria crater is getting bigger at the same sort of rate that the capes are moving. Then there would always be a supply of fresh undisturbed strata from which to carve out the new capes.
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Posts in this topic
- Tesheiner   To the Cape! (part 2)   Jun 13 2008, 08:10 AM
- - MahFL   They are nice pictures. Makes a change to see some...   Jun 13 2008, 10:38 AM
- - fredk   It's great to see us thoroughly out of the Qua...   Jun 13 2008, 03:16 PM
- - Tesheiner   Before the, mmm, "event", I thought Oppo...   Jun 13 2008, 08:56 PM
- - alan   Winter Solstice occurs in the southern hemisphere ...   Jun 13 2008, 11:24 PM
- - Tesheiner   Neither the black not the white path, Opportunity ...   Jun 16 2008, 09:43 AM
- - Astro0   A lo-res SFX view based on Tesheiner's positio...   Jun 17 2008, 06:56 AM
|- - mhoward   QUOTE (Astro0 @ Jun 17 2008, 12:56 AM) A ...   Jun 18 2008, 12:38 AM
- - Tman   And overcomes sand traps again and chocks like thi...   Jun 17 2008, 07:50 AM
- - Tesheiner   I was a bit afraid with the path they were taking ...   Jun 17 2008, 10:11 AM
|- - fredk   QUOTE (Tesheiner @ Jun 17 2008, 10:11 AM)...   Jun 17 2008, 02:53 PM
- - climber   You may say that it's easy to say it now, but ...   Jun 17 2008, 11:21 AM
- - Stu   Nice view...   Jun 17 2008, 02:14 PM
- - Tesheiner   We are getting closer! This is from today...   Jun 18 2008, 10:17 AM
|- - fredk   And the maneuvering at the end of the drive shows ...   Jun 18 2008, 02:56 PM
- - fredk   Another big drive downslope tosol (1565). The nav...   Jun 19 2008, 03:32 PM
|- - Tesheiner   QUOTE (fredk @ Jun 19 2008, 05:32 PM) The...   Jun 20 2008, 10:45 AM
|- - jamescanvin   QUOTE (Tesheiner @ Jun 20 2008, 11:45 AM)...   Jun 20 2008, 10:59 AM
- - climber   We're gonna need your "man in black...   Jun 19 2008, 04:45 PM
- - lyford   Sweet Fancy Moses! So nice to be moving again...   Jun 19 2008, 09:02 PM
- - Zeke4ther   This cliff structure reminds me of sandstones I sa...   Jun 19 2008, 11:15 PM
- - AndyG   Assuming the range is 16m or so, and our fredk is ...   Jun 20 2008, 08:47 AM
- - ngunn   Looks like the perfect spot for another picnic.   Jun 20 2008, 09:20 AM
|- - peter59   QUOTE (ngunn @ Jun 20 2008, 09:20 AM) Loo...   Jun 20 2008, 09:37 AM
- - peter59   We are very near. http://qt.exploratorium.edu/mars...   Jun 20 2008, 09:58 AM
- - Tman   Looks like it's a popular place here - someone...   Jun 20 2008, 12:45 PM
- - mhoward   A few frames from an imaginary movie "zooming...   Jun 20 2008, 01:08 PM
- - Stu   Yes! THIS is what we came all this way to see...   Jun 20 2008, 01:59 PM
- - lyford   "MY GOD! IT'S FULL OF BAKLAVA!...   Jun 20 2008, 03:15 PM
- - Doc   I must say this is an impressive view of the Cape....   Jun 21 2008, 08:43 AM
- - fredk   Do you folks remember this Victoria's wishlist...   Jun 21 2008, 02:36 PM
- - ElkGroveDan   I am drooling at the prospect of seeing a nice cle...   Jun 21 2008, 02:52 PM
- - Astro0   QUOTE (Tesheiner @ Jun 20 2008, 08:45 PM)...   Jun 21 2008, 11:25 PM
- - Sunspot   What happened to yesterdays downlink? Or did they...   Jun 22 2008, 07:46 AM
- - jamescanvin   No day off, there was a drive planned yesterday ac...   Jun 22 2008, 10:00 AM
- - peter59   No comment ! http://qt.exploratorium.edu/mar...   Jun 22 2008, 12:37 PM
|- - ugordan   QUOTE (peter59 @ Jun 22 2008, 02:37 PM) N...   Jun 22 2008, 12:50 PM
- - nprev   ...well, there went my socks!   Jun 22 2008, 12:48 PM
- - jamescanvin   I think the front hazcam is my favourite htt...   Jun 22 2008, 12:49 PM
- - BrianL   Looks like a "toe dip" onto the scree (i...   Jun 22 2008, 01:41 PM
- - jamescanvin   Navcam Pan   Jun 22 2008, 02:36 PM
|- - mhoward   QUOTE (jamescanvin @ Jun 22 2008, 07:36 A...   Jun 22 2008, 03:21 PM
||- - ElkGroveDan   QUOTE (mhoward @ Jun 22 2008, 07:21 AM) I...   Jun 22 2008, 03:37 PM
|- - Tesheiner   QUOTE (jamescanvin @ Jun 22 2008, 04:36 P...   Jun 22 2008, 05:19 PM
- - Aussie   Go Oppy! Take the limelight back from that ...   Jun 23 2008, 07:07 AM
- - Stu   New pancam images are up... http://qt.exploratori...   Jun 23 2008, 12:07 PM
|- - fredk   QUOTE (Stu @ Jun 23 2008, 12:07 PM) New p...   Jun 23 2008, 02:43 PM
|- - Stu   QUOTE (fredk @ Jun 23 2008, 03:43 PM) I h...   Jun 23 2008, 03:00 PM
- - Bill Harris   What do you mean? The pancams of the cliff are ex...   Jun 23 2008, 12:43 PM
|- - brellis   After four+ years, my jaw still hangs open at what...   Jun 23 2008, 12:46 PM
- - Stu   Well, good luck "processing" something o...   Jun 23 2008, 12:46 PM
- - DEChengst   Three frame stitch: http://paranoid.dechengst.nl...   Jun 23 2008, 04:05 PM
- - mhoward   Yeah that overexposed stuff is from sol 1562 (seve...   Jun 24 2008, 12:24 AM
- - peter59   I have great expectations. Sol Seq.Ver ETH ES...   Jun 24 2008, 06:58 AM
- - fredk   One of the first closeup pancams, from sol 1570: h...   Jun 24 2008, 02:39 PM
- - DEChengst   I truly suck at color correction(tm): http://para...   Jun 24 2008, 03:47 PM
- - Stu   Rockhounds... prepare to go "Oooooooooooooooo...   Jun 24 2008, 07:16 PM
- - Tman   Nice contrast at ~14:40 LTST   Jun 24 2008, 07:26 PM
- - Stu   Best I can do... others will do waay better, I kno...   Jun 24 2008, 08:11 PM
- - Stu   ... and I don't know about anyone else, but I...   Jun 24 2008, 09:47 PM
|- - ElkGroveDan   QUOTE (Stu @ Jun 24 2008, 01:47 PM) ... a...   Jun 24 2008, 10:33 PM
- - nprev   Yes...it is never safe to underestimate the reach ...   Jun 24 2008, 11:10 PM
|- - dvandorn   QUOTE (nprev @ Jun 24 2008, 06:10 PM) Yes...   Jun 25 2008, 04:17 AM
|- - ToSeek   QUOTE (nprev @ Jun 24 2008, 07:10 PM) Yes...   Jun 25 2008, 07:18 PM
- - peter59   I was slightly disappointed yesterday, but I have ...   Jun 25 2008, 06:32 AM
- - Stu   Oh my...   Jun 25 2008, 12:54 PM
- - Stu   ... and a couple more views before I head out to w...   Jun 25 2008, 02:39 PM
- - jamescanvin   Not much of tosols bit has come down, but most of ...   Jun 25 2008, 05:57 PM
|- - PaulM   QUOTE (jamescanvin @ Jun 25 2008, 06:57 P...   Jun 25 2008, 07:08 PM
|- - Tesheiner   QUOTE (PaulM @ Jun 25 2008, 09:08 PM) Am ...   Jun 26 2008, 03:28 AM
- - ElkGroveDan   Has there been any attempt to correlate the layers...   Jun 25 2008, 08:16 PM
|- - antoniseb   Opportunity's little Mossbauer unit must be pr...   Jun 25 2008, 09:15 PM
- - Stu   Hot off the press...   Jun 26 2008, 03:10 PM
- - Stu   ... and 3D view...   Jun 26 2008, 03:18 PM
- - Stu   ... and a bit of the floor, too... lots of rocks O...   Jun 26 2008, 03:20 PM
- - Stu   Definitely one of my favourite post-entry views...   Jun 26 2008, 03:34 PM
- - jamescanvin   Today's offering. James   Jun 26 2008, 08:22 PM
- - fredk   Another sol, another spectacular set of pancams - ...   Jun 27 2008, 04:52 PM
- - peter59   My favourite views: http://qt.exploratorium.edu/m...   Jun 27 2008, 05:21 PM
|- - algorimancer   QUOTE (peter59 @ Jun 27 2008, 11:21 AM) h...   Jun 28 2008, 01:38 AM
|- - Juramike   QUOTE (algorimancer @ Jun 27 2008, 08:38 ...   Jun 28 2008, 02:01 AM
- - jamescanvin   Just one image short of completing the sol 1570/1 ...   Jun 27 2008, 06:14 PM
|- - dilo   Superb mosaic, James, even with dirt and unfilled ...   Jun 27 2008, 10:29 PM
- - nprev   Mmm...differential weathering? I've seen appar...   Jun 28 2008, 02:10 AM
|- - SteveM   QUOTE (nprev @ Jun 27 2008, 09:10 PM) Mmm...   Jun 28 2008, 02:26 PM
- - Juramike   I'm wondering if we are seeing deposition, til...   Jun 28 2008, 03:40 AM
- - Phil Stooke   No - much more likely to be just cross-bedding - i...   Jun 28 2008, 04:01 AM
|- - Juramike   QUOTE (Phil Stooke @ Jun 27 2008, 11:01 P...   Jun 28 2008, 04:23 AM
- - Bill Harris   At first glance it looks like truncated cross-beds...   Jun 28 2008, 05:06 AM
- - Shaka   Ultimately, these questions all hearken back to th...   Jun 28 2008, 05:55 AM
|- - ElkGroveDan   QUOTE (Shaka @ Jun 27 2008, 09:55 PM) Why...   Jun 28 2008, 07:31 AM
|- - PaulM   QUOTE (ElkGroveDan @ Jun 28 2008, 08:31 A...   Jun 28 2008, 08:21 AM
|- - ElkGroveDan   QUOTE (PaulM @ Jun 28 2008, 12:21 AM) The...   Jun 28 2008, 04:06 PM
- - Bill Harris   Agreed, but I've not been able to wrap my brai...   Jun 28 2008, 02:16 PM
|- - Juramike   QUOTE (Bill Harris @ Jun 28 2008, 10:16 A...   Jun 29 2008, 10:24 PM
- - centsworth_II   Concerning cracks and weathering around Victoria...   Jun 28 2008, 02:22 PM
|- - ElkGroveDan   QUOTE (centsworth_II @ Jun 28 2008, 06:22...   Jun 28 2008, 04:10 PM
- - Doc   The question of whether the pattern of the crater ...   Jun 29 2008, 10:06 PM
- - Shaka   Why is the rim shape so rare on Mars? Sand and wi...   Jun 30 2008, 12:24 AM
- - Bill Harris   I've seen other examples in HiRISE images of s...   Jun 30 2008, 12:46 AM
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