Jefferson and Clear Creek Counties, Colorado Sheridan, Douglas M. 1921- creator Taylor, Richard B. (Richard Bartlett) joint author. Marsh, Sherman P. 1935- joint author. text dcu Washington 1968 monographic eng

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iii, 7 p. illus., map. 26 cm. by Douglas M. Sheridan, Richard B. Taylor, and Sherman P. Marsh. n-us-co Rutile Colorado Jefferson County Rutile Colorado Clear Creek County Topaz Colorado Jefferson County Topaz Colorado Clear Creek County Gneiss Colorado Jefferson County Gneiss Colorado Clear Creek County Geology, Stratigraphic Precambrian QE75 .C5 no. 567 549.5/24 gs 68000264 //r935 U.S. Geological Survey Library 690523 20260227111422.0 gs 68000264