observed in three outcrops in Erebus crater by robot geologist Opportunity, perhaps capturing climate changes from dry to wet to dry conditions. These discoveries are described in a wonderfully detailed article in the May 2009 issue of the Journal of Sedimentary Research (link to technical abstract.)
I'd still like to visit someday and actually hammer on an outcrop.
Link to previous related post.
Thursday, June 4, 2009
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