58 x 47 cm., on sheet 81 x 81 cm., folded in envelope 30 x 24 cm. Relief shown by contours and spot heights. "Geology mapped in 1962. Contours on pre-Cenozoic rocks by D. L. Healey and C. H. Miller, 1958-63." Includes text, col. cross section and quadrangle location map. "Prepared in cooperation with the U.S. Atomic Energy Commission." Original publisher: Interior, Geological Survey, Series: Geologic quadrangle map GQ, Scale: 1:24 000.