- Usage in publication:
-
- Center Hall formation
- Modifications:
-
- Named
- Dominant lithology:
-
- Limestone
- AAPG geologic province:
-
- Appalachian basin
Summary:
Named the Center Hall formation for Center [Centre] Hall, Centre Co., central PA. Unit is a zone of impure limestone, 15 feet thick, that overlies the Valentine formation and underlies Rodman limestone. Thickens to east. The Center Hall is not faunally or lithologically very different from the Carlim limestone which underlies the Valentine formation. The Valentine thins to the east and its beds are successively replaced by the upper beds of the Carlim, the younger of which appears to be synchronous with the Center Hall at Bellefonte.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Centre Hall member
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Appalachian basin
Summary:
Spelling of Centre Hall is changed to reflect spelling village unit is named for. Revised the Centre Hall to the Centre Hall member of the Nealmont limestone. Overlies Oak Hall member and underlies Rodman member, both of the Nealmont. Thickness is about 45 feet. The Centre Hall is of Middle Ordovician age.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Centre Hall Member*
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Appalachian basin
Summary:
Middle Ordovician Centre Hall Formation of Field (1919, p. 47) adopted as Centre Hall Member and assigned to Nealmont Formation of Trenton Group in central PA according to the usage of the Pennsylvania Geological Survey. Underlies Rodman Member of Nealmont Formation; overlies Benner Formation.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Center Hall Member
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Appalachian basin
Summary:
Linden Hall Formation here extended to include Center [Centre] Hall Member above the Stover and Oak Hall Members. No basis given for Late Ordovician age assignment.
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 ([ ]).