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Nanjemoy Formation
The Nanjemoy Formation is a geologic formation pertaining to both the Wilcox Group and the Pamunkey Group of the eastern United States, stretching across the states of Virginia, Maryland, and the District of Columbia. The formation crops out east of the Appalachians and dates back to the Ypresian stage of the Eocene epoch, about 55 to 50 Ma or Wasatchian in the NALMA classification. It is roughly contemporaneous with the Wasatch Formation of the Interior West.
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