This image shows Rocks explored by the Rover.
Click on image for full size
Image from: JPL/NASA
Possible Origins of Rocks explored by the Rover
Unlike Earth where rivers can carry material for hundreds of miles, Martian rivers, which seem to be not very long at all, cannot transport material very long distances. The farthest a river may be able to carry a rock may be only 10's of kilometers.
Because many of the rocks seem to be similar, some scientists are presently guessing that the boulders may have been eroded from an outcropping 30 km away.
On the other hand, some of the weathering features found on the rocks may be signs that some of the rock originated as ejecta from the Big Crater located 2.2 kilometers to the south of the landing site.
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