I-2012 Stratigraphic cross section showing upper Paleocene coal-bearing rocks of the Tongue River member of the Fort Union Formation in the Piney Canyon SE Quadrangle, Weston County, southeastern Powder River basin, Wyoming, scale 1:24,000, 1990, ISBN 978-0-607-79172-3 Keywords: Stratigraphy, Stratigraphic Geology, Coal, Mines and mining, Natural resources, Powder river basin