clay minerals in gale crater Aug 23, 2012 13:02:15 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Marsrocks on Aug 23, 2012 13:02:15 GMT -5 Clay is both a sign of past life, and a magnet for civilization, if one ever existed.adsabs.harvard.edu/abs/2011AGUFM.P33C1774Pmarsoweb.nas.nasa.gov/landingsites/msl/workshops/5th_workshop/talks/Tuesday_AM/Vaniman_May_2011_Landing_Site_Workshop.pdf