NASA's Mars Global Surveyor shows a typical example of a crater partially filled with layered material in the northern mid-latitude of Mars.

18 April 2004
Unlike southern mid-latitude craters, many northern mid-latitude craters do not have gullies but are instead partially filled with layered material. Often, the crater ejecta blankets are also partially covered. This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a typical example located near 38.9°N, 185.3°W. The picture covers an area about 3 km (1.9 mi) across. Sunlight illuminates the scene from the lower left.

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