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The "Lump of Good Hope", Significant..?
fredk
post Feb 22 2007, 08:49 PM
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Interesting blocky feature visible in the latest navcams (centred in this crop):
Attached Image

I've identified it orbitally - it's the block marked with the black arrow in this crop:
Attached Image

It appears to be at the exposed end of - dare I say it - a linear feature marked with white arrows in that crop.
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Gray
post Feb 22 2007, 09:20 PM
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Good observation noting the apparent linear feature. I'll withhold comment for now smile.gif ...

That big block looks like it's in the brecciated zone. I wonder if it's just a mega-sized fragment in the breccia.
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dvandorn
post Feb 22 2007, 09:26 PM
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It's a little tough to say whether the feature in question is linear or arcuate, though I admit it looks more linear to me. (If it's arcuate, it's not really concentric to the impact point, is it...?)

-the other Doug


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“The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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dvandorn
post Feb 22 2007, 09:35 PM
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Looking at the features along this portion of the rim a little more carefully, I get a gestalt impression of the entire landmass that contains the current capes and bays having slumped down fractures as the pressure of the mass in the rockbed has decreased as the rockbed has descended into the crater pit.

Look at it this way -- the Guam area, and the area along this new linear feature, are all places where the land between the feature and the rim of Victoria has slumped down a bit, a few centimeters here and there. No more than half a meter, I'd bet, anywhere along the line. Now, these may have been impact-created fractures or they may have been pre-existing, but as mass was removed from the rockbeds between these fractures and the rim of the crater, the entire rockbled has slumped along these fracture lines. Leaving these little ridges that we're seeing, here.

Looking at it, my first impression is that the Guam formation represents slumping along an impact-generated fracture, while this linear feature is along a pre-existing linear fracture within the rockbeds.

-the other Doug


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“The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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Tesheiner
post Feb 23 2007, 11:01 AM
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While waiting for today's batch of images from Opportunity, just tell that the next cape clockwise (C3) has been named Cape of Good Hope.
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Tesheiner
post Feb 23 2007, 12:04 PM
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Sol 1096 images are downlinked and available.
Here is a three-frame navcam mosaic looking east and covering Bay C3, Cape of Good Hope (C3), Bay C5, and Cape D1.

Attached Image


Edit: I'm wondering if we would have a chance to "snif" the bright layer of bedrock --the first layer right below the jumbled ejecta-- we have seen on all (?) bays and capes since Duck Bay. It looks like that layer might be accessible at the tip of cape D1 or perhaps the one following D1. unsure.gif
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Stu
post Feb 23 2007, 02:17 PM
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Quick close-up...

Attached Image


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WindyT
post Feb 23 2007, 02:53 PM
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QUOTE (Tesheiner @ Feb 23 2007, 12:04 PM) *
Here is a three-frame navcam mosaic looking east and covering Bay C3, Cape of Good Hope (C3), Bay C5, and Cape D1.

Attached Image
Cape of Good Hope(C3) and Cape D1 look like they were uplifted during the impact -- more so than some of the other capes we've seen to date. Very interesting stuff.

(Feel free to move this to a new cape thread)
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ngunn
post Feb 23 2007, 04:02 PM
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QUOTE (dvandorn @ Feb 22 2007, 09:35 PM) *
Looking at the features along this portion of the rim a little more carefully, I get a gestalt impression of the entire landmass that contains the current capes and bays having slumped down fractures as the pressure of the mass in the rockbed has decreased as the rockbed has descended into the crater pit.

-the other Doug


This sounds very like what I have been suggesting for some time. Just add one ingredient - a buried layer of highly hydrated material that got fluidised by the impact shock.
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fredk
post Feb 23 2007, 04:26 PM
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QUOTE (Tesheiner @ Feb 23 2007, 11:01 AM) *
... the next cape clockwise (C3) has been named Cape of Good Hope.
I'm curious where you heard this Tesheiner?
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Guest_Edward Schmitz_*
post Feb 23 2007, 04:34 PM
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Is anyone else curious about that lump on the next cape. It looks like an intact out crop where I would expect jumbled ejecta.

ed
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MarkL
post Feb 23 2007, 04:58 PM
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Its a very interesting lump indeed. Perhaps a single large block of ejecta that has resisted erosion, or come from another impact?

The dark material at the base of the eastern capes is getting more interesting as we get closer. It seems to be associated with a specific layer in the section which is perhaps more fully exposed along the northeastern extent of the crater edge. Maybe it is a blueberry rich seam?
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Tesheiner
post Feb 23 2007, 05:12 PM
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QUOTE (fredk @ Feb 23 2007, 05:26 PM) *
I'm curious where you heard this Tesheiner?


Elementary, my dear Watson! biggrin.gif
Among the planned imaging sequences for tosol (1096) was this one:

01096 p2373.10 16 0 0 16 2 34 pancam_cape_good_hope_longbaseline_L257R2
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MarkL
post Feb 23 2007, 05:46 PM
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You can see the Lump of Good Hope in the attached image cropped and up-sized from the original MRO shot. It does seem quite out of place and is possibly associated with an east northeast-trending fault. I hesitate to call it that because all I see is the barest indication that there may be a fault which has created some elevation differential leading to the abrupt edge of the dunefield to the north. There seems to be a depression to the east of the lump as well but I can't pick this out from the navcams mosaiced above.

Attached Image
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WindyT
post Feb 23 2007, 07:16 PM
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QUOTE (MarkL @ Feb 23 2007, 05:46 PM) *
[...]possibly associated with an east northeast-trending fault. I hesitate to call it that because all I see is the barest indication that there may be a fault which has created some elevation differential leading to the abrupt edge of the dunefield to the north.
I laughed at first because I was thinking how odd it would be for a fault to show through that ejecta debris, but I'm a believer of sorts now. If that is a fault, it would show in the bay, and if it shows in the bay, what would it look like?
Attached Image


No smoking gun, but there does look to be a mismatch in that white layer where I've put the purple hint
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