This crater, in the desert of Western Australia, consists of a granitic uplifted core, about 10 kilometers diameter, surrounded by a dark crescent-shaped inner ring unit. An outer ring of Precambrian sediments has a diameter of about 20 kilometers. The appearance of this impact structure is complicated by salt deposits (light units) produced by shallow lakes that seasonally fill the depressions and evaporate. It has recently been renamed the Shoemaker impact structure, in honor of the late geologist Eugene M. Shoemaker, who was one of the founding fathers of impact research.
Space shuttle image STS41D-42-039.