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minocin mr After its triumphant arrival on the Red Planet in August 2012, Curiosity trundled only a quarter-mile from its landing spot to a tantalizing depression named Yellowknife Bay. There it didn't take long for the rover's instruments to reveal an expanse of thick, fine-grained rock, the footprint of an ancient lake. Tests showed the rock, a type known as a mudstone because it's formed from mud, is similar to 10-million-year-old rocks in Southern California. This single lake probably covered tens of thousands of acres, and there were probably at least several other lakes nearby, says Caltech's John Grotzinger, project scientist for Curiosity.