1. Geologic map and coal stratigraphic framework of the Paonia area, Delta and Gunnison counties, Colorado Yale Public content 1989. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Colorado, Delta County, and Gunnison County.