- Usage in publication:
-
- Lansdale shales
- Modifications:
-
- Named
- Dominant lithology:
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- Shale
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
- Newark basin
Summary:
Soft red calcareous shales with scattered green layers are here named the Lansdale shales in the New Red series. Overlies the Gwynedd shales and underlies the Perkasie shales. It forms a broad belt extending from Uhlerstown and Erwinna on the Delaware River, past Lansdale, to Royersford on the Schuylkill River. Thickness is 4,700 feet.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Lansdale shales*
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
- Newark basin
Summary:
The Triassic series in the Philadelphia district is represented by the Norristown, Gwynedd, Lansdale, Perkasie, and Pottstown shales. It is footnoted that N. H. Darton divides the Triassic into the Stockton formation, corresponding to the Norristown, the Lockatong formation, corresponding to the Gwynedd, and the Brunswick shale, corresponding to the Lansdale, Perkasie, and Pottstown.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Lansdale†
- Modifications:
-
- Abandoned
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
- Newark basin
Summary:
The classification of the Newark group established in NJ is here adopted by the USGS in PA. It comprises the Stockton, Lockatong, and Brunswick formations, approximately equivalent to the Norristown, Gwynedd, and Lansdale, respectively, which have not been found acceptable because of their indefinite application.
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 ([ ]).