Glenelg - Page 11

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Posts: xxx

Reply: 201

PostPosted: October 19, 2012 4:13 PM 

Coral, anyone?

Also, don't miss what seems to be a very thin, upright plate at the front (with shadow).

Sol 66, from which there are a few more pics of the same type, but agonizingly out of focus...


Posts: xxx

Reply: 202

PostPosted: October 19, 2012 6:33 PM 

really amazing ! all those colors and textures...weird !


Posts: xxx

Reply: 203

PostPosted: October 20, 2012 8:57 AM 

Look middle-left:

Strange dark-brown (?) rock-like-object sitting on top of big rock (?):


Posts: 3465

Reply: 204

PostPosted: October 20, 2012 3:40 PM 

sol 0073 MAHLI enhanced difference false color 3D of soil from scoop:

with a location link.

Lots of different particle "colors" and shapes. It reminds me of Phoenix soil.

Well worth the download to cruise around the image at 200% using StereoPhoto Maker.

Er, about those dark "scratches"...


Posts: xxx

Reply: 205

PostPosted: October 21, 2012 4:33 PM 

The newest batch of MastCam images at

shows a lot of patches of snow white stuff.

One example (there are many, this is not the biggest patch but very visible) can be seen on the larger rock middle-right in the following image:

I don't know how to post images otherwise I would post a zoomed and color enhanced version.

Ice? Salt? Martian analog of moss/lichen?


Posts: 125

Reply: 206

PostPosted: October 21, 2012 5:06 PM 

Re #205. Chaosman... took me awhile to find it. Used 200% magnification and there it was. You mean, I presume, in the crevice of the laarge rock middle-right?


Posts: 344

Reply: 207

PostPosted: October 21, 2012 10:41 PM 

Nice find, chaosman. Here's a crop and zoom. (It's in the shadowed area.)


Posts: 3465

Reply: 208

PostPosted: October 22, 2012 9:12 AM 

sol 0074 enhanced difference false color soil dump animation:

You must view the original size to see the animation.

Er, where did the small pebbles in the scoop go? Were they just clumps that broke up when they landed?


Posts: xxx

Reply: 209

PostPosted: October 22, 2012 1:40 PM 

@Barsoomer, RJS:

Thank you very much ! You found it! Thank you for the magnification!
As I said, there are MANY white patches in the area. Not all are so easy to spot.

One more of the better examples is located just a bit to the right of the center of the following image in the crevice between two rocks:

This white patch seems to show a pattern of sme kind.

I wonder if this white stuff is the same as the white particle found in the trench.
I also wonder if the mission team is aware of all the white patches. This would really deserve a closer look in my opinion.

Nice animation, I also wonder where the pebbles went.


Posts: xxx

Reply: 210

PostPosted: October 22, 2012 3:31 PM 

One last example to make the point that there is a lot of white stuff around and then I will stop pushing it. See on the larger rock in the center:

Snow-White again...


Posts: 250

Reply: 211

PostPosted: October 22, 2012 3:58 PM 

chaosman, I hope that the MSL team publish the chem data of the white patch in the scoop hole soon. I think we can safely assume that the results we be exemplary for the rest of the white stuff around. Smile
I guess this could turn out to be the first major finding of MSL besides soil organics.

What I also think is peculiar about this white patches is its predominance in shadowed areas.
Also I somewhat think that it could be some (white) fluorescent material (if not ice/snow) like human teeth under black light - on Mars there is constant "black light" illumination as we all know (almost unfiltered solar UV influx).


Posts: xxx

Reply: 212

PostPosted: October 22, 2012 5:02 PM 

I totally agree.
I also have the impression that the white stuff is mainly in shadowed areas, however, I'm not absolutely sure.
Fluorescence could be an option as well...
...and yes, I wouldn't be surprised if the white stuff in the soil has the same or similar composition.
I really hope that NASA takes care at all, even if it might slow the progress towards Mount Sharp...

Very Happy


Posts: 344

Reply: 213

PostPosted: October 22, 2012 5:21 PM 

Is there a matching 3D image? A 3D view would be very helpful because it is conceivable to me that some of the white areas might simply be small regions that are illuminated by sunlight in the midst of shadowed areas.


Posts: xxx

Reply: 214

PostPosted: October 22, 2012 6:14 PM 

Sorry I can't provide 3d (I can't even post magnifications).
For me the posted examples are very cleary more white than any reflections in the surrounding, however there are many more areas that are indeed difficult to tell for sure...
3D would indeed be helpful....anyone?


Posts: 3465

Reply: 215

PostPosted: October 23, 2012 12:41 PM 

sol 0067 enhanced difference false color detail of chaosman rock:

with Location links back to shadow enhanced view with Location links back to Navcam 3D views of the rock.

I couldn't find any Left MastCam view of this area. Perhaps only thumbnails are available now.

The basic problem is the chaosman rocks are mostly backlit and in shadow so without good 3D it is almost impossible to make sense of the rocks.

But it looks to me in the details that the "white" areas are the same "blue" color as the sunlit postions of the rock and appear to be seen through a notch in the rock.

As an aside, what do the rock guys make of this strange rock?:

or this one:

or any of the rocks from this area?

I spent some time trying to figure them out and concluded that I am not a very good geologist.


Posts: 1

Reply: 216

PostPosted: October 23, 2012 2:53 PM 

Your rocks in 215 - my favoured explanations but not unique unless I saw the context.

1. Looks like weathered limestone, an effect you get when rainwater rests on a surface for a long time, weathering it because it acts as a weak acid over time.
2. Cross bedded sandstone, with a calcareous matrix that varies in concentration. The more carbonate rich beds weather faster, causing the depressions. The 'ribs' standing proud have the least amount of carbonate. Channeling is evident, could be meanders.


Posts: 3465

Reply: 217

PostPosted: October 23, 2012 4:11 PM 

newboy, if you follow the this link in reply 215 then you will see the context.

I was fascinated by this area because the context is a lot like where Opportunity is now. Some of the rocks I would almost swear were taken by Oppy.


Posts: 1

Reply: 218

PostPosted: October 23, 2012 6:45 PM 

Oh Hort I did! gorgeous photos.

But there is clearly something missing here for both of us. A geologist plugs into visual clues that come from his/her training. Non-geologists see the rocks in a more abstract way. I can never go back to just being visual because I am trained.
When I said context, I meant geological context. The crater is punched into the Earth rocks. The geological history of the rocks in the crater is not related to the meteorite, except in their alteration by pressure and heat. The rocks you photographed are 'normal', as I described them. But the rocks Oppy is looking at have been pummeled so much that the pummeling itself is part of the features observed. That makes them special for us Earth bound geos, who only see craters as rare events at home.


Posts: 3465

Reply: 219

PostPosted: October 24, 2012 1:19 PM 

sol 0076 enhanced difference false color 5x2 close panorama of rocks and soil of Glenelg area:

********* NOTICE *****************

There currently is an Comment Input problem for some pages of some topics! Page 6 of the Glenelg topic seems to be OK for posting new comments to this topic.

I have sent Mark an e-mail outlining the problem. I think it is related to a recent change made to the ImageShack site that is causing the blog's Movable Type interface to mal-function - so please don't post links to ImageShack until this is resolved.

*** oops ***

Seems I'm the only one having this problem. Pay no attention to this notice.

Kye Goodwin

Posts: 1166

Reply: 220

PostPosted: October 24, 2012 2:50 PM 

Here's another example of recent indigenous soil disturbance, center-left under the edge of the largest rock:

I wonder why these occur where they do. We've seen them at all three rover sites. This is already the second at Gale. Presumably they are some Mars equivalent of a dune crest avalanche, loaded by wind and then disturbed by gravitational mass wasting, but no rover has imaged an actual dune or dune avalanche, just ripples without slip faces.

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