SUMMARY: NASA announced today that Opportunity has found evidence that the rocks around it were built up at the bottom of an ancient Martian salty ocean. The rover has found evidence of cross-bedding, where inclined layers of rocks are formed through sedimentation. Scientists aren't sure how long ago the sediments were created, so they're planning to send Opportunity to another outcropping of rock to make more observations. These kinds of rock formations are ideal for finding fossil evidence of past life; unfortunately, Opportunity's instruments aren't sensitive enough to see fossils if they're there.

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