Title: Ammonites and some characteristic bivalves from the Upper Cretaceous Frontier Formation, Natrona County, Wyoming /
Authors: Cobban, William A., 1916-2015; Geological Survey (U.S.)
Publisher: Dept. of the Interior, U.S. Geological Survey ; For sale by the Books and Open-File Reports Section,
Year: 1990
Subjects: Bivalves, Fossil Wyoming Natrona County.; Ammonoidea Wyoming Natrona County.; Geology, Stratigraphic; Paleontology Wyoming Natrona County.; Paleontology; Frontier Formation.