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Geologic Unit: Curtin
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Map showing publication footprint
  • Usage in publication:
    • Curtin limestone
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Kay, G.M., 1943, Chemical lime in Pennsylvania: Economic Geology, v. 38, no. 3, p. 188-203.


Summary:

Named the Curtin limestone as uppermost unit in Black River group for Curtin Gap, Centre Co., central PA. Consists of impure and relatively pure limestone with five metabentonites (termed A-E). Unit is divided into the Valley View member and overlying Valentine member. Thickness is 143 feet at type locality and thins along northwest side of Nittany Valley to extinction along line from Tyrone to north of Lemont, Oak Hall, and Spring Mills, and south of Millheim. Overlies Stover member of Benner limestone and unconformably underlies Nealmont limestone. The Curtin is of Middle Ordovician age.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Curtin†
  • Modifications:
    • Abandoned
  • AAPG geologic province:
    • Appalachian basin

For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).