1. Geologic map and coal sections of the Thornburgh quadrangle, Moffat and Rio Blanco Counties, 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, Moffat County, and Rio Blanco County.