Monmouth Group

Monmouth Group
Stratigraphic range: Late Santonian to late Maastrichtian,
TypeGroup
Sub-unitsSee text
UnderliesRancocas Group
OverliesMagothy Formation
Lithology
PrimaryMarl, glauconite
Location
RegionNew Jersey, Pennsylvania, New York, Delaware, Maryland
CountryUnited 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. 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. 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:

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