- Usage in publication:
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- Rancocas formation
- Modifications:
-
- Named
- Dominant lithology:
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- Greensand
- Sand
- AAPG geologic province:
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- Atlantic Coast basin
Summary:
Rancocas formation named for exposures along Rancocas Creek in Burlington Co., NJ. Composed largely of greensand, although much more highly glauconitic in lower than in upper half. Lower half largely a pure greensand, but in some parts of State it becomes very argillaceous toward base, forming the so-called "chocolate marl." Is Middle Marl bed of previous reports. Thickness 45 ft. Underlies Manasquan formation and overlies Redbank formation.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Rancocas Group*
- Modifications:
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- Revised
- Age modified
- AAPG geologic province:
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- Atlantic Coast basin
Summary:
Rancocas Group in NJ expanded to include the Eocene Manasquan Formation. Group now subdivided into (ascending) Hornerstown, Vincentown, and Manasquan Formations. Age of Rancocas, therefore, is modified to Paleocene and Eocene. Underlies Miocene(?) Kirkwood Formation and overlies Upper Cretaceous Red Bank Formation of Monmouth Group.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Rancocas Group
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Atlantic Coast basin
Summary:
Report offers excellent overview of the Hornerstown and Vincentown Formations, which compose the Rancocas Group as used here. Discussion includes age, lithology, thickness, fauna, and areal extent. Unit overlies the Monmouth Group and underlies the Shark River Formation. The K/T boundary occurs in the basal portion of the Hornerstown. The age of the Rancocas, therefore, is Late Cretaceous and Paleocene.
Source: GNU records (USGS DDS-6; Reston GNULEX).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).