1. 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
2. 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