The type Fox Hills Formation, Cretaceous Maestrichtian, South Dakota - Waage, Karl Mensch, 1915-; Yale University. Peabody Museun of Natural History (New Haven, 1968)
pt. 1. Stratigraphy and Paleoenviroments.-pt. 2. Systematics of the Bivalvia by Ian G. Speden.
Includes bibliographical references (pt. 1. p. 168-171).
Keywords: Speden, Ian G; Geology, Stratigraphic -- Cretaceous -- South Dakota; Geology -- South Dakota -- Cretaceous