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Ogallala

Ogallala
Ogallala Although Opportunity spent a lot of time driving in April, the robot field geologist did stop to check out this outcrop. It turned out to be somewhat familiar, but its chemistry does not neatly match other bedrock types. “We’re still trying to work it out,” said MER Deputy Principal Investigator Ray Arvidson. NASA / JPL-Caltech / Cornell / ASU