Bright Soil Near McCool: Salty Deja Vu?

Light-toned soil deposits might be widely distributed on the flanks and
valley floors of the Columbia Hills region in Gusev Crater. The salts 
may record past presence of water, as they are easily mobilized and 
concentrated in liquid solution

Light-toned soil deposits might be widely distributed on the flanks and valley floors of the Columbia Hills region in Gusev Crater. The salts may record past presence of water, as they are easily mobilized and concentrated in liquid solution