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The discovery of the tilted shoreline linked to precession etc seems to confirm a Young Wet Mars...
Okay, I'll not get into the knotty issue of 'when last', whether 1 aeon ago, or three...
Given a time when parts of Mars were wet, so above freezing at sea level, what would conditions have been like in Valles Marineris ??
That's a big, big canyon. How many miles deep ?? Five ?? Yeah, right...
IMHO, nearest Terrestial equivalent would be the Messinian Event, when the Med dried up.
Are there any estimates of temperatures, pressures and weather atop the plateau, mid-wall and down in the Valles Bottomlands ??
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