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John Kierein
2004-Apr-28, 01:28 AM
http://marsrovers.jpl.nasa.gov/gallery/all/1/p/082/1P135474653EFF1200P2428R1M1.JPG

Charlie in Dayton
2004-Apr-28, 01:56 AM
Very tiny meteorite impact sites?

This is suggested by the image I recall from a PBS special concerning Gene Shoemaker's research. He'd simulate meteorite impacts by firing a rifle down into sand. Very coarse sand gave something that looks very much like what's in that picture...