58 x 46 cm., on sheet 85 x 83 cm., fold. in envelope 30 x 24 cm. Relief shown by contours and spot heights. "Contour interval 20 feet." "Prepared in cooperation with the U.S. Atomic Energy Commission." "Geology mapped in 1961. Contours on pre-Tertiary rocks by D. L. Healey and C. H. Miller, 1963." Includes text, 4 col. cross sections, and quadrangle location map. Original publisher: U. S. Geological Survey, Series: Geologic quadrangle map GQ, Scale: 1:24 000.