Washington, DC: United States Geological Survey/USGS/Government Printing Office/GPO, 1964. Softcover. Item #42939
Three species of ammonites, assigned to the new genus Trachyscaphites, provide a means for the correlation of Upper Cretaceous strata between the Western Interior, the Gulf Coastal Plain, and Europe. 13 pages with tables and references, plus four photographic plates bound in the rear. Bound in thick gray paper covers printed in black. Small library stamp, withdrawn stamp and call number on the front cover. No other library markings, pockets of plates were ever present. A near fine copy.