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] 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.[4]
| 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 |
See also
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References
edit- ^ 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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