Potomac Group: Difference between revisions
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[[File:Potomac Group 20240413.jpg|thumb|right|240px|Exposure of part of the Potomac Group at [[Elk Neck State Park]], Maryland]] |
[[File:Potomac Group 20240413.jpg|thumb|right|240px|Exposure of part of the Potomac Group at [[Elk Neck State Park]], Maryland]] |
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The '''Potomac Group''' is a [[Group (geology)|geologic group]] in [[Delaware]], [[Maryland]], [[New Jersey]], and [[Virginia]]. It preserves [[fossils]] dating back to the [[Cretaceous]] [[Period (geology)|period]]. An indeterminate [[tyrannosauroidea|tyrannosauroid]] and ''[[Priconodon crassus]]'', a [[nodosauridae|nodosaurid]], are known from indeterminate sediments belonging to the Potomac Group.<ref>{{Cite journal|last=Brownstein|first=Chase Doran|date=2018|title=A Tyrannosauroid from the Lower Cenomanian of New Jersey and Its Evolutionary and Biogeographic Implications|url=https://bioone.org/journals/bulletin-of-the-peabody-museum-of-natural-history/volume-59/issue-1/014.058.0210/A-Tyrannosauroid-from-the-Lower-Cenomanian-of-New-Jersey-and/10.3374/014.058.0210.full|journal=Bulletin of the Peabody Museum of Natural History|volume=59|issue=1|pages=95–105|doi=10.3374/014.058.0210|issn=0079-032X}}</ref> The Potomac Group was initially believed to have been [[Late Jurassic]] in age by [[Othniel Charles Marsh]]<ref name=OCM88>Marsh |
The '''Potomac Group''' is a [[Group (geology)|geologic group]] in [[Delaware]], [[Maryland]], [[New Jersey]], and [[Virginia]]. It preserves [[fossils]] dating back to the [[Cretaceous]] [[Period (geology)|period]]. An indeterminate [[tyrannosauroidea|tyrannosauroid]] and ''[[Priconodon crassus]]'', a [[nodosauridae|nodosaurid]], are known from indeterminate sediments belonging to the Potomac Group.<ref>{{Cite journal|last=Brownstein|first=Chase Doran|date=2018|title=A Tyrannosauroid from the Lower Cenomanian of New Jersey and Its Evolutionary and Biogeographic Implications|url=https://bioone.org/journals/bulletin-of-the-peabody-museum-of-natural-history/volume-59/issue-1/014.058.0210/A-Tyrannosauroid-from-the-Lower-Cenomanian-of-New-Jersey-and/10.3374/014.058.0210.full|journal=Bulletin of the Peabody Museum of Natural History|volume=59|issue=1|pages=95–105|doi=10.3374/014.058.0210|issn=0079-032X}}</ref> The Potomac Group was initially believed to have been [[Late Jurassic]] in age by [[Othniel Charles Marsh]]<ref name=OCM88>{{last=Marsh|first=Othniel Charles|year=1888|title=Notice of a New Genus of Sauropoda and Other New Dinosaurs From the Potomac Formation|journal=American Journal of Science|volume=s3-35|issue=205|pages=89-94|doi=10.2475/ajs.se-305.205.89|url=https://ajsonline.org/article/62522-notice-of-a-new-genus-of-sauropoda-and-other-new-dinosaurs-from-the-potomac-formation}}</ref> but later studies, such as [[William Bullock Clark|Clark]] (1897), have found that the Potomac Group is in fact [[Early Cretaceous|Early]]-[[Late Cretaceous]] ([[Aptian]]-[[Turonian]]) in age.<ref name="Clark1897">{{Cite report|last=Clark|first=W.B.|year=1897|title=Outline of present knowledge of the physical features of Maryland|publisher=Maryland Geological Survey|series=Volume Series|volume=1|pages=172-188|url=https://ngmdb.usgs.gov/Prodesc/proddesc_90375.htm}}</ref> 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.<ref name=":5">{{Cite journal |last1=Frederickson|first1=Joseph A.|last2=Lipka|first2=Thomas R.|last3=Cifelli|first3=Richrad L.|date=2018-08-28 |title=Faunal composition and paleoenvironment of the Arundel Clay (Potomac Formation; Early Cretaceous), Maryland, USA |url=https://palaeo-electronica.org/content/2018/2290-arundel-fauna-of-maryland-usa |access-date=2024-10-28 |journal=Palaeontologia Electronica |article-number=21.2.31A |language=en |doi=10.26879/847}}</ref> |
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==See also== |
==See also== |
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Revision as of 15:49, 3 December 2024
| 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 |
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]
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.
- ^ Template:Last=Marsh
- ^ 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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