- Usage in publication:
-
- Sewell marls
- Modifications:
-
- Named
- Dominant lithology:
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- Marl
- AAPG geologic province:
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- Atlantic Coast basin
Summary:
Pg. 316-338. Sewell marls. Dark greensand marls, with glauconite thickly disseminated. Thickness 20 to 30 feet. Basal division of Rancocas formation. Overlies Monmouth formation and underlies Vincentown limesands, the top division of Rancocas formation. Age is Eocene.
Named from town of Sewell, northwestern Gloucester Co., NJ.
[GNC remark (ca. 1936, US geologic names lexicon, USGS Bull. 896, p. 1962): †Sewell Formation of Rancocas Group abandoned. This name being preoccupied, it was replaced with Hornerstown marl, which is now classified as a formation of Rancocas group. See Clark (1907) entry under Hornerstown.]
Source: US geologic names lexicon (USGS Bull. 896, p. 1962); supplemental information from 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 ([ ]).