- Usage in publication:
-
- Campbell's Ledge black slate
- Modifications:
-
- Named
- Dominant lithology:
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- Slate
- AAPG geologic province:
-
- Appalachian basin
Summary:
Named for Campbell's Ledge, near Coxton, Lackawanna Co., northeastern PA. Included in Pottsville conglomerate, but it also underlies the conglomerate and rests on 0 to 3 ft of hard gray or creamy white sandstone, also included in Pottsville. Consists of highly bituminous black slate. Thickness is 0 to 10 ft; at type locality, thickness is 5 ft. Contains plants and insects. Age is Pennsylvanian.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
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- Campbell Ledge Shale Member*
- Modifications:
-
- Revised
- Age modified
- Overview
- AAPG geologic province:
-
- Appalachian basin
Summary:
Revised as Campbell Ledge Shale Member [new spelling] of Pottsville Formation. Consists of dark-gray to black, carbonaceous and coaly shale and thin coal lenses, massive where fresh, but fissile or platy where partly weathered. Contains many species of plant fossils and some species of insects. Has been observed at many localities in Northern Anthracite field where basal Pottsville is exposed. Age refined to Middle Pennsylvanian on the basis of fossils described by White (1900); they indicate that the Campbell Ledge is younger than Lykens Valley No. 1 coal bed of Lower Pennsylvanian Schuylkill Member of Pottsville.
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 ([ ]).