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

Butts, Charles, 1918, Geologic section of Blair and Huntingdon Counties, central Pennsylvania: American Journal of Science, 4th series, v. 46, p. 523-537.


Summary:

Named the Carlim limestone for Carlim, Blair Co., central PA. Consists of dark, fine-grained limestone that is quarried extensively for flux. Includes the Lemont limestone member at top. Thickness is 180 feet. Overlies Bellefonte dolomite of Beekmantown group and underlies Lowville limestone. Correlates with Crown Point limestone in NY. The Carlim is of Middle Ordovician (Chazyan) age.

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


Map showing publication footprint
  • Usage in publication:
    • Carlim limestone*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Appalachian basin
Publication:

Butts, Charles, 1945, Hollidaysburg-Huntingdon folio, Pennsylvania: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-227, 20 p., scale 1:62,500


Summary:

The Carlim limestone is 100 to 200 feet thick in Blair Co. where it is divided into a lower unnamed member and the Lemont limestone member. Unconformably overlies the Bellefonte dolomite and unconformably underlies the Lowville limestone.

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


Map showing publication footprint
  • Usage in publication:
    • Carlim
  • Modifications:
    • Not used
  • AAPG geologic province:
    • Appalachian basin
Publication:

Cooper, G.A., 1956, Chazyan and related brachiopods [U.S.-Canada]: Smithsonian Miscellaneous Collections, v. 127, pt. 1, 1245 p.


Summary:

Published fossil lists of Butts' collections from his Carlim limestone indicate that the unit is not Chazyan. In view of confusion, it seems best to drop the term Carlim in favor of Kay's terms Loysburg and Hatter.

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


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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 ([ ]).