Abstract
The Mars Exploration Rover Spirit has traversed a fairly flat, rock-strewn
terrain whose surface is shaped primarily by impact events, although
some of the landscape has been altered by eolian processes. Impacts
ejected basaltic rocks that probably were part of locally formed
lava flows from at least 10 meters depth. Some rocks have been textured
and/or partially buried by windblown sediments less than 2 millimeters
in diameter that concentrate within shallow, partially filled, circular
impact depressions referred to as hollows. The terrain traversed
during the 90-sol (martian solar day) nominal mission shows no evidence
for an ancient lake in Gusev crater.
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