Also available online in PDF format from the U.S. Geological Survey Warehouse (http://pubs.er.usgs.gov/).
"Westward equivalents of Bear River and Aspen Formations are divided into five new formations by two red-bed tongues of the Wayan Formation. The Hilliard Shale changes northward to sandstone of the upper part of the new Blind Bull Formation."
Bibliography
Includes bibliographical references (pages 34-35).