1. Geologic map of the northwestern part of the Uncompahgre Uplift, Grand County, Utah, and Mesa County, Colorado, with emphasis on Proterozoic rocks Yale Public content 1991. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey ; For sale by Map Distribution. English. Public. Utah, Grand County, Colorado, and Mesa County.