1. Geologic map of the Parker quadrangle, Arapahoe and Douglas Counties, Colorado [cartographic material] Yale Public content 1972. 2013-02-21T14:30:22Z. 2013-03-18T22:37:23Z. Maberry, John O., 1935-. U.S. Geological Survey. English. Public. Colorado, Arapahoe County, Douglas County, Arapahoe County (Colo.), and Douglas County (Colo.).