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Nanjemoy Formation
Stratigraphic range: Ypresian (Wasatchian) ~54.5–50.3 Ma
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Ꞓ
O
S
D
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P
T
J
K
Pg
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Type
Formation
Unit of
Pamunkey Group
Sub-units
Woodstock & Potapaco
Underlies
Piney Point & Calvert
Overlies
Aquia & Marlboro Clay
Thickness
About 20 m (66 ft)
Lithology
Primary
Sandstone, claystone
Other
Marl, limestone
Location
Coordinates
38°48′N76°42′W / 38.8°N 76.7°W / 38.8; -76.7
Approximate paleocoordinates
39°06′N60°48′W / 39.1°N 60.8°W / 39.1; -60.8
Region
Virginia Maryland District of Columbia
Country
United States
Extent
Extent
Type section
Named for
Nanjemoy Creek Etymology
Named by
Clark & Martin
Year defined
1901
Nanjemoy Formation (the United States)
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Nanjemoy Formation (Maryland)
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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 District of Columbia. The formation crops out east of the Appalachians and dates back to the Paleogene period. Specifically to the Ypresian stage of the Eocene epoch, about 55 to 50 Ma or Wasatchian in the NALMA classification, defined by the contemporaneous Wasatch Formation of the Pacific US coast.
The about 20 metres (66 ft) thin formation crops out in a narrow irregular band and only in certain of the many creeks of the Maryland peninsula and on the southern side of the Potomac River in Virginia. The two members the formation was divided into by Clark and Martin in 1901; Potapaco and Woodstock, represent different phases in the basin history. The lower Potapaco Member is much more clayey, described as marl, than the upper Woodstock Member, probably characteristic of less storm influences in the shallow shelf sediments.
The formation has provided a wealth of fossils of mainly fish, but also mammals, reptiles, birds and flora. The presence of the sharks Otodus obliquus and Carcharocles aksuaticus, as well as various other shark and ray species are notable. Crocodylian, snake, turtle, mammal, and bird remains have all been found in the Nanjemoy Formation.[1]
^Weems & Grimsley, 1999
and 28 Related for: Nanjemoy Formation information
The NanjemoyFormation is a geologic formation pertaining to both the Wilcox Group and the Pamunkey Group of the eastern United States, stretching across...
Eocene epoch. They have been found in the Woodstock Member of the NanjemoyFormation of Maryland and Virginia and Ypresian sediments in Aktulagay, Kazakhstan...
North America, including Maryland and Virginia (from the early Eocene NanjemoyFormation), Georgia and Mississippi. These species varied broadly in size; Palaeophis...
In 2016, Gerald Mayr described E. gulottai from the early Eocene NanjemoyFormation in Virginia. However, in 2022, Mayr, alongside Andrew C. Kitchener...
Eocene London Clay of Walton-on-the-Naze, United Kingdom and the NanjemoyFormation of Virginia, United States. The genus contains three species, Pulchrapollia...
transitional teeth. Some teeth have been excavated from the sediments of the NanjemoyFormation in Maryland, USA, Ypres clay in Belgium, and western Kazakhstan, which...
List of fossiliferous stratigraphic units in Mexico Klondike Mountain FormationNanjemoyFormation Lechería Limestone Indio Formation at Fossilworks.org...
James River. The Aquia formation is overlain by the NanjemoyFormation and overlies the Brightseat Formation. The Aquia formation is broken down into two...
charadriiform bird, and other avian remains from the early Eocene NanjemoyFormation of Virginia (USA)" (PDF). Phatfossils.com. Archived (PDF) from the...
messelasturid remains have also been reported from the early Eocene NanjemoyFormation of Virginia in the United States. An indeterminate bird from the Paleocene...
strigiform bird from the Early Eocene London Clay Formation of Essex, United Kingdom and NanjemoyFormation of Virginia, United States. The genus contains...
Eocene deposits of Germany and France. An Early Eocene record from the NanjemoyFormation of Virginia, United States (USNM 496384) is very doubtful, as apodiform...
which the same formation is exposed. Such sites may have separate entries if they are considered to be more notable than the formation as a whole. In...
halcyornithids have been found in the Green River Formation of the US state of Utah as well as the NanjemoyFormation of the state of Virginia. Placement of the...
Ypresian formations Fur Formation of Denmark London Clay Formation of England Silveirinha Formation of Portugal Wasatchian formationsNanjemoyFormation of...
been found in the Green River Formation of Wyoming and possibly the NanjemoyFormation of Virginia. The holotype of Morsoravis, MGUH 28930, consists of an...
charadriiform bird, and other avian remains from the early Eocene NanjemoyFormation of Virginia (USA)" (PDF). Paläontologische Zeitschrift. Retrieved...
The Piney Point Formation is a geologic formation in Virginia. It preserves fossils dating back to the Lutetian Stage of the Eocene Epoch of the Paleogene...
NanjemoyFormation, contemporaneous fossiliferous formation of the eastern United States Wasatch Formation, contemporaneous fossiliferous formation of...
Scofield (2021) describe new fossil material of birds from the Eocene NanjemoyFormation (Virginia, United States), including the first representatives of...
formations NanjemoyFormation of the eastern United States Wasatch Formation of the western United States Itaboraian formations Itaboraí Formation of Brazil...
England Silveirinha Formation of Portugal Wasatchian formationsNanjemoyFormation of the eastern United States Wasatch Formation of the western United...
Pamunkey Group Stratigraphic range: Paleogene Type Group Sub-units Aquia Formation, NanjemoyFormation Location Region Virginia Country United States...
Ypresian of England (London Clay) and the eastern United States (NanjemoyFormation in Maryland and Virginia), with specimens from elsewhere being placed...
charadriiform bird, and other avian remains from the early Eocene NanjemoyFormation of Virginia (USA)". PalZ (Paläontologische Zeitschrift). 90 (4): 747–763...
England Silveirinha Formation of Portugal Wasatchian formationsNanjemoyFormation of the eastern United States Wasatch Formation of the western United...
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Virginia
Maryland
District of Columbia
United States
