1. Detailed cross sections of the Eocene Green River formation along the North and East margins of the Piceance Basin, western Colorado, using measured sections and drill hole information Author/Creator: Johnson, Ronald C. 1950- (Ronald Carl), cartographer Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2014 Resource Type: Map Access & Availability: Loading
2. Simplified stratigraphic cross sections of the Eocene Green River formation in the Piceance Basin, Northwestern Colorado Author/Creator: Dietrich, John D., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2013 Resource Type: Book Access & Availability: Loading