NASA's Mars Global Surveyor shows the ridged surface in the lower half of this image is that of a large lava flow in Daedalia Planum, southwest of the Arsia Mons volcano. This image was taken June 5, 1999.

The ridged surface in the lower half of this image is that of a large lava flow in Daedalia Planum, southwest of the Arsia Mons volcano. The flow was stopped here by a buried crater rim (topographic high in the upper half of the image). MOC image taken June 5, 1999.

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