- Usage in publication:
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- Doylesburg member
- Modifications:
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- Named
- Dominant lithology:
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- Limestone
- AAPG geologic province:
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- Appalachian basin
Summary:
Named the Doylesburg member of the Shippensburg formation in south-central PA for Doylesburg in Path Valley, Franklin Co., PA. Consists of massive-bedded, white-weathering, dove calcilutite with dark gray, fine-grained, platy limestone at top. In western belts, two locally intertonguing lithofacies recognized: calcilutite facies and platy limestone facies with heavy interbeds of medium-gray to dove limestone conglomerate. Facies variations distributed in northeast-trending belts. Thickness is 6 to 40 feet. Conformably overlies Fannettsburg member and disconformably underlies Mercersburg formation. The Doylesburg is of Middle Ordovician age.
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 ([ ]).