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Surrounding both martian polar caps are thick deposits of windblown material that advance or recede depending on long-term climatic cycles of Mars. As deposits recede, buried impact craters are exhumed. Although most small craters are obliterated by this process, larger craters generally survive, although their features are degraded and floor deposits often remain. Largest crater
in image is 49 km in diameter and is at 79.1° S, 232.0° W; Viking
Orbiter frame 383B67 Right
click here to download a high-resolution version of the image (2.03 MB)
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