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Monmouth Group
| Monmouth Group | |
|---|---|
| Stratigraphic range: Late Santonian to late Maastrichtian, | |
| Type | Group |
| Sub-units | See text |
| Underlies | Rancocas Group |
| Overlies | Magothy Formation |
| Lithology | |
| Primary | Marl, glauconite |
| Location | |
| Region |  New Jersey,  Pennsylvania,  New York,  Delaware,  Maryland |
| Country |  United States |
The Monmouth Group or Matawan Group is a major Late Cretaceous-aged geologic group in the eastern United States, known from New Jersey, Pennsylvania, New York, Delaware, and Maryland.[1] It comprises a number of geological formations dating from the Santonian to nearly the end of the Maastrichtian, deposited in nearshore environments off the coast of eastern Appalachia, including deltaic and marine ecosystems.[2] It is highly fossiliferous and preserves a diverse array of fossils, including some of the most prominent dinosaur-bearing deposits of eastern North America.
The following formations are included, from youngest to oldest:[2][3][1]
- New Egypt Formation (=Tinton Formation) (youngest, late Maastrichtian)
- Red Bank Formation[4]
- Navesink Formation
- Severn Formation[5]
- Mount Laurel Formation
- Wenonah Formation
- Marshalltown Formation (=Matawan Formation)
- Englishtown Formation (=Matawan Formation)
- Woodbury Formation
- Merchantville Formation (=Matawan Formation) (oldest, late Santonian to early Campanian)
- ^ a b "Geolex — Monmouth publications". ngmdb.usgs.gov. Retrieved 2024-11-12.
- ^ a b "PBDB". Paleobiology Database. Retrieved 2024-11-12.
- ^ "Coastal Plain Rock Units (Stratigraphic Chart) | The Delaware Geological Survey". www.dgs.udel.edu. Retrieved 2024-11-12.
- ^ "Geolex — RedBank publications". ngmdb.usgs.gov. Retrieved 2024-11-12.
- ^ "Geolex — Severn publications". ngmdb.usgs.gov. Retrieved 2024-11-12.
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