1. Geologic and aeromagnetic maps of the Fossil Ridge area and vicinity, Gunnison County, Colorado [cartographic material] Yale Public content 2002. 2003-04-01T14:31:43Z. 2016-07-15T21:10:50Z. Geological Survey (U.S.). U.S. Geological Survey ; Information Services [distributor]. English. cartographic image. Public. Colorado, Gunnison County, and Gunnison County.