Glenelg - Page 20

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Posts: 56

Reply: 381

PostPosted: December 21, 2012 6:04 AM 

@Mauree. It looks like a mineral. The scale of this picture is about 0,5cm across (my guess), so we are looking at grains.

Interesting stuff!


Posts: 3062

Reply: 382

PostPosted: December 21, 2012 6:56 AM 



Posts: 3062

Reply: 383

PostPosted: December 24, 2012 9:02 PM 

Another auto white balanced image from a sol 135 Mast Cam image. Note the highlighted oval area. Some interesting "rock" surface aggregations.



Posts: xxx

Reply: 384

PostPosted: December 24, 2012 11:41 PM 

Looks like lichen (Xanthoria elegans), but it can't be; there's no lichen on Mars, so what an interesting rock! Very cool and totally worth the taxpayer's 2.4 billion dollars. Maybe one day, those footing the bill will get to know exactly what this and all the other "interesting rocks" truly are.

I can't wait for another water announcement followed by the much-anticipated "it sure looks like it coulda been livable a long time ago, we don't know for sure, so maybe not, but it is certainly within the realm of possibility!" habitability announcement.


Posts: xxx

Reply: 385

PostPosted: December 26, 2012 2:15 AM 

Washhed out Sol 111 MARDI image of what appears to be a microbial mat with some interesting "rocks," if Mars could even have such a thing because we have no idea if it was ever, or could be, habitable. Maybe, maybe not, but certainly possible, but who knows for sure? The conditions would have had to have been just right...


Posts: 3062

Reply: 386

PostPosted: December 30, 2012 10:03 PM 

Another interesting rock (to me). sol 141, Auto White balanced. Showing unusual structures on undersurface of rock, now exposed


Kye Goodwin

Posts: 1166

Reply: 387

PostPosted: December 31, 2012 1:51 PM 

Hi LWS, re your 385, Funny I was just about to post the same source image for a different reason:

I'm intrigued by that distinct pile of dark sand partly tucked under a rock (above and to the left of the center of the image). I wonder how it maintains such a dark color relative to the surrounding dusty surfaces. It could be simply that the variations of air movement strip some surfaces of dust while leaving others covered. The rocks in that image have some surfaces covered in dust and others fairly bare of dust in a pattern that could be explained by relative exposure to wind, so maybe this also explains why the dark pile of sand is bare of dust. But somehow I'm not satisfied. In places the lower boundary of the dark sand pile with the dusty pebbles is very sharp, suggesting that the sand has been deposited over the dust. There are some faint markings in the sand that suggest avalanching.

It is also hard for me to visualize how that one big distinct pile of sad blew into place without more of the same collecting against every rock.

How does the dark sand in the "dune fields" surrounding the central mound manage to maintain such a dark color?

Apparently the dark sand is covered with less bright dust than most of the rest of the landscape. It might be interesting to know why. Is the dark sand as active as the dust? Is the moat perhaps a windier place than the rest of Gale?

J.Chris Campbell

Posts: xxx

Reply: 388

PostPosted: December 31, 2012 4:17 PM 

Could it be because the tall rock beside it is protecting it from wind and light for a much longer period of the day?
Or a little more unlikely, a underwater aquifer comes close to the surface in this location,, along with the shielding.


Posts: 3062

Reply: 389

PostPosted: December 31, 2012 4:56 PM 

Hi Kye; Actually it was the dark dust emerging from under the rock that I first noticed. There is an almost identical image of dark sand expressed by Spirit from under what looks like a basalt rock at gusev possibly by the spirit game wheel, in my collection. I'll look for it and post it later.

I don't think the dark sand is a manifestation of wind movement. I think its more primal than that.



Posts: 3062

Reply: 390

PostPosted: December 31, 2012 6:29 PM 

Kye; See chapter five of my ebook, "In search of life on Mars". There's an image of the Spirit rock exuding dark dust there, along with other insights.



Posts: 3062

Reply: 391

PostPosted: December 31, 2012 7:54 PM 



Posts: xxx

Reply: 392

PostPosted: January 2, 2013 10:29 PM 


I agree. The darker sediments are obviously not wind-created due to the lack of similar sediments piled up against other rocks.

What about frost heave? Seems like that could explain the "soil exuding from the rock."

This should be termed Harvey Dent rock. The side with the brown is bright and looks more lively. The side without the brown is dark and looks dead.


Posts: xxx

Reply: 393

PostPosted: January 8, 2013 11:20 PM 

Sol 149:

The brownish-green stuff on the side of this rock doesn't appear to be a shadow. Looks a little licheny.

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