- Usage in publication:
-
- Housum member
- Modifications:
-
- Named
- Dominant lithology:
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- Limestone
- Metabentonite
- AAPG geologic province:
-
- Appalachian basin
Summary:
Named the Housum member of the Mercersburg formation for community of Housum, Franklin Co., south-central PA. Unit is lower member of formation. Consists of tan to medium-gray, fine-grained, argillaceous, slabby, cream- to buff-weathering limestone with 10 foot interval of dark-gray, thin, crinkly, gray-weathering limestone near top. Contains lowest metabentonite of formation. Maximum thickness is 67 feet at type locality; thins northeastward. Disconformably overlies Fannettsburg member of Shippensburg formation and conformably underlies Kauffman member of Mercersburg formation. The Housum 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 ([ ]).