NASA's Mars Global Surveyor shows a ring of boulders on the floor of a southern mid-latitude basin on Mars. The sharp, inner ring of boulders and knobs is the location of the rim of a filled and buried impact crater.

MGS MOC Release No. MOC2-345, 29 April 2003

This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a ring of boulders on the floor of a southern mid-latitude basin. The sharp, inner ring of boulders and knobs is the location of the rim of a filled and buried impact crater. The outer, diffuse ring of boulders is the material ejected from the impact crater when it formed. The crater and its ejecta are only thinly buried beneath the surface. This feature is located near 55.5°S, 333.3°W. Sunlight illuminates the scene from the upper left.

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