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Jon |
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There was nothing interesting about Sputnik two years ago when they arrived, and there's nothing interesting about it now. Doug |
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but it's on Mars- that makes it kind of interesting, doesn't it?
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"blacker than the blackest black... times infinity."- Nathan Explosion The.. Best.. Thread..Ever... |
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Way out on the horizon, way out, there are some peaks on the left, and some peaks on the right. That's Endeavour Crater's rim. Doesn't look so far. She'll be there in no time! Edit: Now available at NASA Mars Exploration Rover Mission Raw Images :: Opportunity :: Navigation Camera :: Sol 1661
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I'm suggesting the sandstone is only a surficial layer at most a few centimeters thick and beneath it would be basaltic rock, with the sandstone surface layer being formed from aqueous alteration of the basaltic lava in the manner of pillow lava. This would explain the presence of the basaltic sand which that LPI abstract I cited suggested there were no obvious sources for. I'm suggesting this basaltic sand comes from the basaltic rock beneath the sandstone layer. One way to test this might be if the Opportunity rover ran over a smaller, protruding sandstone rock causing it to crack, thus revealing the composition of the rock inside. There are some rocks in the vicinity of Sputnik crater this might be tested on. Bob Clark |
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See recent drive noted in article in Unmanned Spaceflight topic Opportunity Route Map.
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Jon |
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This image by Horton on the Marsroverblog.com site strongly implies the basaltic sand originates from inside the wall rock: ![]() See the full size image here: "super 3D panorama of northern Victoria rim on Meridiani Plain, Mars. Taken by Opportunity Feb 23-24, 2007 ( sol 1096-1097)" http://www.flickr.com/photos/hortonheardawho/421241208/ Bob Clark |
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Morphologically, minerologically, your volcanic obsession is totally unproven. |
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The well preserved bedding in the cliff is consistent with a sedimentary origin not volcanic. Further the surface grains are moderately rounded and are well sorted, indicating extensive winnowing and transport. If they were locally derived you would expect see many more angular fragments, including hyper-angular glass shards, and overal poorer sorting. It is fine to consider alternative hypotheses, but if they don't work you can't hang onto them. Jon |
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The prevailing theory is that the sandstone rock is built up in layers over millenia by successive deposition. But if that is true, why does not the layering extend all the way through into the rock? In cracks, the layering only seems to extend a few centimeters: ![]() Bob Clark |
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And this one:
![]() From this post: Cape Verde. http://www.marsroverblog.com/dyn/ent...ssion_page/209 Why does the layering only extend a few centimeters into the rock? Bob Clark |
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And guess what - if you want deep drilling into this rock - you've got it. You got it at Endurance, you got it at Victoria - nature doing the digging for you via impacts. Doug |
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Did you notice the low angle cross bedding in the main cliff? These are the same as those seen in many other places at Meridiani where the rocks were tested with the RAT. Those rocks are sedimentary not volcanic. Jon |
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End of the month means another Planetary Society Mars Exploration Rovers Update
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Located on the lee side of the rim, the target was in “a little dust trap that also turned out to be a nasty little rover trap,” said Squyres. Opportunity slipped repeatedly trying to scale the ridge leading to the chosen target within Bagnold, Laubach said, so the MER team instructed the rover to abandon that assignment and rove on toward its next major destination. “We did our best to get to Bagnold, but it became clear after a few sols that we were just wasting our time,” Squyres said. “We could try for months and never get to it, so it was time to go.” Pity Ralph Bagnold is no longer around to give advice of desert travel! Wikipedia hardly does justice to the career of this extraordinary human being. http://en.wikipedia.org/wiki/Ralph_Alger_Bagnold See also: http://www.weru.ksu.edu/symposium/pr...s/underwoo.pdf http://www.geolsoc.org.uk/gsl/null/lang/en/page553.html Jon |
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Spirit update (archive):
Nothing new Opportunity update (archive): sol 1655-1660, 24-Sep-2008: Road Trip Gets Under Way
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Spirit update (archive):
sol 1685-1689, September 28 - October 03, 2008: Spirit and Earth Stick Together Opportunity update (archive): sol 1661-1668, September 25-30, 2008: Opportunity Takes a Victory Lap
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