Potomac Group
The Potomac Group is a geologic group in Delaware, Maryland, New Jersey, and Virginia. It preserves fossils dating back to the Cretaceous period. An indeterminate tyrannosauroid and Priconodon crassus, a nodosaurid, are known from indeterminate sediments belonging to the Potomac Group.[1] The Potomac Group was initially believed to have been Late Jurassic in age by Othniel Charles Marsh[2] but later studies, such as Clark (1897), have found that the Potomac Group is in fact Early-Late Cretaceous (Aptian-Turonian) in age.[3]
| Potomac Group | |
|---|---|
| Stratigraphic range: Cretaceous, | |
 | |
| Type | Group |
| Sub-units | Patuxent Formation, Arundel Formation, Patapsco Formation, Raritan Formation, Potomac Formation (?) |
| Underlies | Raritan Formation, Magothy Formation |
| Overlies | Boonton Formation |
| Location | |
| Region |  Delaware,  Maryland,  New Jersey,  Virginia |
| Country |  United States |
References
- Brownstein, Chase Doran (2018). "A Tyrannosauroid from the Lower Cenomanian of New Jersey and Its Evolutionary and Biogeographic Implications". Bulletin of the Peabody Museum of Natural History. 59 (1): 95–105. doi:10.3374/014.058.0210. ISSN 0079-032X.
- Marsh, O.C. (1888). Notice of a new genus of Sauropoda and other new dinosaurs from the Potomac Formation. American Journal of Science 135:89-94.
- Clark, W.B., (1897), Outline of present knowledge of the physical features of Maryland: Maryland Geological Survey Volume Series, v. 1, pt. 3, p. 172-188.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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