Fossil Seals from the Calvert Formation of the Pamunkey River, Hanover County, VirginiaOld Dominion University232–235
Ray, Clayton Edward. 1984. "Fossil Seals from the Calvert Formation of the Pamunkey River, Hanover County, Virginia." In Stratigraphy and Paleontology of the Outcropping Tertiary Beds in the Pamunkey River Region, Central Virginia Coastal Plain, Guidebook for the 1984 Field Trip, Atlantic Coastal Plain Geological Association. Ward, L. W. and Krafft, Kathleen, editors. 232–235. Norfolk: Old Dominion University.