- Usage in publication:
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- Graters members
- Modifications:
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- Named
- Dominant lithology:
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- Shale
- AAPG geologic province:
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- Newark basin
Summary:
A group of three thick-bedded, hard, dark gray or greenish-gray to black shale beds, separated by comparable beds of red shale, occurring about 2,200 ft above the base of the Brunswick formation in the Silverdale section is here named the Graters members, because of exposures near Graters Ford, PA. The Graters is comprised of the shales designated F, G, and H in the section along Landis Brook. Their outcrop is marked by a ridge which ends before reaching the Schuylkill River to the west.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Graters shales
- Modifications:
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- Redescribed
- Dominant lithology:
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- Shale
- AAPG geologic province:
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- Newark basin
Summary:
Gray shales G and H, the Graters shales, poorly shown near the Delaware River, are continuous with gray shales exposed at Graters Ford, 30 miles southwest.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Graters member
- Modifications:
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- Areal extent
- AAPG geologic province:
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- Newark basin
Summary:
At Graters Ford and for several miles east and north there are three gray members of the Graters, designated F, G, H. From near Sellersville to east of Frenchtown, NJ, there are only two thick gray strata, members G and H of the Graters.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Graters Member*
- Modifications:
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- Revised
- AAPG geologic province:
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- Newark basin
Summary:
The Graters Member of the Brunswick Formation is here revised to include a lower gray unit (shale member G of McLaughlin), an upper gray unit (shale member H of McLaughlin), and the intervening red shales. The average thickness of the lower gray unit is 50 ft, of the middle red unit, 42 ft, and of the upper gray unit, 42 ft. It is 1,422 ft stratigraphically above the base of the Brunswick in the Delaware Valley section from Stockton, NJ, to a point three miles west of Milford, NJ.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Graters Member
- Modifications:
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- Revised
- AAPG geologic province:
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- Newark basin
Summary:
The Graters Member is reassigned from the Brunswick Formation, here abandoned, to the Passaic Formation, here named. Age is Late Triassic.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Graters Member
- Modifications:
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- Biostratigraphic dating
- AAPG geologic province:
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- Newark basin
Summary:
The age of the Graters Member of the Passaic Formation is Norian, based on spores in the Passaic.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Graters Member*
- Modifications:
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- Revised
- AAPG geologic province:
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- Newark basin
Summary:
The rank of the Brunswick Formation is here raised to Group. It includes the Passaic Formation of Olsen (1980) in NJ and the equivalent lower part of the Brunswick Group in PA. The Graters Member is present in these units.
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 ([ ]).