| Potomac Group | |
|---|---|
| Stratigraphic range: Cretaceous, Aptian–Turonian PreꞒ Ꞓ O S D C P T J K Pg N | |
 View of Timber Neck showing the Arundel, Patapsco and Raritan Formations of the Potomac Group | |
| 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 |
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. The Potomac Group was initially believed to have been Late Jurassic in age by Othniel Charles Marsh but later studies, such as Clark (1897), have found that the Potomac Group is in fact Early-Late Cretaceous (Aptian-Turonian) in age. The most famous member of the group is the Arundel Formation, which preserves a high diversity of terrestrial vertebrate fauna and provides the most comprehensive look at the dinosaurian fauna of eastern North America during the Early Cretaceous.
See also
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, Othniel Charles (1888). "Notice of a New Genus of Sauropoda and Other New Dinosaurs From the Potomac Formation". American Journal of Science. s3-35 (205): 89–94. doi:10.2475/ajs.se-305.205.89.
- Clark, W.B. (1897). Outline of present knowledge of the physical features of Maryland (Report). Volume Series. Vol. 1. Maryland Geological Survey. pp. 172–188.
- Frederickson, Joseph A.; Lipka, Thomas R.; Cifelli, Richrad L. (2018-08-28). "Faunal composition and paleoenvironment of the Arundel Clay (Potomac Formation; Early Cretaceous), Maryland, USA". Palaeontologia Electronica 21.2.31A. doi:10.26879/847. Retrieved 2024-10-28.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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