Stratigraphy and coal geology of the lower part of the Fort Union Formation in the Grass Creek coal mine area, southwestern Bighorn Basin, Wyoming

COAL-146 Stratigraphy and coal geology of the lower part of the Fort Union Formation in the Grass Creek coal mine area, southwestern Bighorn Basin, Wyoming, scale 1:62,500, 1995, ISBN 978-0-607-76004-0 Keywords: Coal, Natural resources, Mines and mining, Stratigraphic Geology, Stratigraphy, Bighorn basin