29 OCTOBER 2014 

Which Way is Up?Which Way is Up?
We have seen much evidence for lava flows in this region that flowed to much higher levels than the present surface, then deflated or drained away.
Search for the Mars 2 Debris FieldSearch for the Mars 2 Debris Field
The Soviet Mars 2 lander was the first man-made object to touch the surface of the Red Planet when it crashed landed on 27 November 1971.
Hardened Dunes in Arcadia PlanitiaHardened Dunes in Arcadia Planitia
There are several lines of evidence indicating that the dunes have become hardened into cohesive sediment or even into sandstone rock.
Sand Sources Near Athabasca VallesSand Sources Near Athabasca Valles
This image shows a small channel cutting into young volcanic lavas in a region where massive catastrophic flooding took place in the relatively recent past.

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