NASA's Mars Global Surveyor shows a crater is in northern Arabia Terra taken in April 1998. Some craters in the middle latitudes of Mars exhibit strange, concentric- and radial-textured patterns on their floors.

Some craters in the middle latitudes of Mars exhibit strange, concentric- and radial-textured patterns on their floors--as seen here. The origin is presently unknown. This crater is in northern Arabia Terra, and the picture was taken in April 1998.

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