The Aquia formation, outcropping in a belt across Maryland and Virginia, unconformably overlies the Brightseat formation of lowermost Paleocene age. On the basis of planktonic foraminifera collected at type locality, the formation had been dated as upper Paleocene. Others had dated the formation as equivalent to the Eocene Wilcox group. Presence of such Foraminifera as Ceratobulimina perplexa Plummer, Citharina plumoides (Plummer), Robulus midwatensis Plummer, and Bulimina cacumenata Cushman & Parker, together with the evidence planktonic species would seem to indicate a Paleocene age for the formation.

You do not currently have access to this article.