1. Geologic map and cross sections of the Carbondale 30ʹ x 60ʹ quadrangle, west-central Colorado Yale Public content 1984. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution, USGS. English. Public. Colorado. and Colorado.