Degradation of this 7-km-diameter crater located on the floor of the Argyre Basin may be tied to the sinuous ridges surrounding the crater. The ridges may be volcanic dikes left standing after removal of overlying material. An alternate theory is that these ridges are glacial landforms known as eskers. In this case, the erosive action of the glacier would be responsible for the degradation of the crater. 55.48° S, 40.24° W; Viking Orbiter frame 567B33 Right
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