Ronald C. Johnson John D. Dietrich 2013 Thirteen stratigraphic cross sections of the Eocene Green River Formation in the Piceance Basin of northwestern Colorado are presented in this report. Originally published in a much larger and more detailed form by Self and others (2010), they are shown here in simplified, page-size versions that are easily accessed and used for presentation purposes. Modifications to the original versions include the elimination of the detailed lithologic columns and oil-yield histograms from Fischer assay data and the addition of ground-surface lines to give the depth of the various oil shale units shown on the cross section. application/pdf 10.3133/ofr20131012 en U.S. Geological Survey Simplified stratigraphic cross sections of the Eocene Green River Formation in the Piceance Basin, northwestern Colorado reports