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Looks Like The Driest Place On Mars
SigurRosFan
post Feb 2 2006, 07:01 PM
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- http://www.msss.com/mars_images/moc/2006/02/02/ - Broken Plain

--- This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows polygonally patterned ground on the floor of a trough in the southern hemisphere of Mars. The polygons could be an indicator that ground ice is or was present at this location. The dark streaks were formed by passing dust devils. ---


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stevo
post Feb 2 2006, 08:23 PM
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QUOTE (Richard Trigaux @ Feb 2 2006, 03:14 PM)
If you speak of the boulders visible half-way of the gullies, I think that simply the gullies (and all the slope) were cut through several layers, one of these would give boulders and the others not. This, I think, has nothing to do with glaciations. (but the presence of gullies could).
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Sorry Richard, my question could have been better phrased:

What processes on Mars would lead to a layer of boulders like this?

Steve


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post Feb 2 2006, 08:42 PM
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QUOTE (stevo @ Feb 2 2006, 08:23 PM)
Sorry Richard, my question could have been better phrased:

What processes on Mars would lead to a layer of boulders like this?

Steve
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Many.

It looks like there are at least three different horizontal parallel layers in this ground. A harder one gave boulders, the others not, because they were more fragile, or basically of a sandy or powdery structure.

The two possibilities to have multiple parallel horizontal layers are :

-sedimentary deposits (in a large body of water, but wind can sometimes do the job)
-multiple lava layers, eventualy hard ones (plain flows) or more fragile ones (ash deposits).

The second possibility is much more common on Mars, but we cannot exclude the first. And on this photo we cannot known. Perhaps some Mars specialists better know the context of this image and may have more accurate answers.
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