Pollack Craters Liquid Past Options

[SigurRosFan]

Is Pollack a remnant of a giant crater lake like Gusev?

Pollack Crater and White Rock:


Release: 4 December 2000 - http://www.msss.com/mars_images/moc/dec00_seds/pollack/

Release: 14 November 2005 - http://www.msss.com/mars_images/moc/2005/11/14/

More images - http://images.google.de/images?svnum=10&hs...mars&btnG=Suche

What is White Rocks origin, a sedimentary outcrop? Liquid past?

[edstrick]

The layered sediments of Pollack crater are clearly part of a massively eroded regional remnant deposit. Scattered all over a region north and east of the Meridiani layered deposits are apparently unrelated or distantly related deposits in many craters. Big examples are the layered plateaus in Becquerel crater, Henry crater and another next to it in Arabia, and the Pollack crater deposit. Non of them seem to be colorimetrically distinctive, unlike Meridiani materials, in Viking color data. Just bright and reddish. There doesn't seem to be much evidence of the material except as remnants forming isolated plateaus in large craters well separated from the crater walls. But they're thick. The one in Henry crater, in particular is massive.