Gruitheisen Domes

This image shows two mare domes in northwestern Mare Imbrium. They are located on the rim of an old, mare-filled impact crater. Note -- These domes differ in color both from mare basalts and from typical highland rocks (see mare types). They may mark a rare instance of non-basaltic lunar volcanism. (Lunar Orbiter Image V-182-M, from Wilhelms (1987) The Geologic History of the Moon, USGS Prof. Paper 1348.)

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