Named for Daniel J. Milton, geologist with the U.S. Geological Survey. Milton, who has carried out geological studies of the moon and Mars, is best known for his investigations of meteorite craters and ancient impact features in Australia. His work on structural deformation at the largest Henbury meteorite craters and in the central uplift of the Gosses Bluff structure, Northern Territory, are tours de force in detailed geologic mapping. (M 17656) _ _.