Andrews, G.W. (1984) Miocene diatomaceous beds of the Calvert Formation at Pope's Creek, Charles County, Maryland IN: Frederiksen, N.O. and Krafft, K. (eds), Cretaceous and Tertiary Stratigraphy, Paleontology, and Structure, Southwestern Maryland and Northeastern Virginia. American Association of Stratigraphic Palynologists Field Trip Volume and Guidebook.
