At this site in the lower mounter in Gale Crater, orbiting instruments have detected signatures of both clay minerals and sulfate salts. This change in mineralogy may reflect a change in the ancient environment in Gale Crater.(Photo/NASA)
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At this site in the lower mounter in Gale Crater, orbiting instruments have detected signatures of both clay minerals and sulfate salts. This change in mineralogy may reflect a change in the ancient environment in Gale Crater.(Photo/NASA)
