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Geologic Unit: Larke
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Map showing publication footprint
  • Usage in publication:
    • Larke dolomite
  • Modifications:
    • Named
  • Dominant lithology:
    • Dolomite
    • 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 Larke dolomite for Larke, Blair Co., central PA. Consists of thick-bedded, coarse, steely blue limestone [dolomite]. Thickness is 250 feet. Overlies the Mines dolomite and unconformably underlies the Beekmantown group. The Larke is of Early Ordovician age.

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


Map showing publication footprint
  • Usage in publication:
    • Larke dolomite*
  • Modifications:
    • Revised
  • 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:

Revised the Larke dolomite as a part of the Beekmantown group in central PA. Consists of 250 feet of thick-bedded dolomite. Overlies Mines dolomite and underlies Nittany dolomite, both of Beekmantown group.

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


Map showing publication footprint
  • Usage in publication:
    • Larke Formation
  • Modifications:
    • Areal extent
    • Revised
  • AAPG geologic province:
    • Appalachian basin

Map showing publication footprint
  • Usage in publication:
    • Larke Formation
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Appalachian basin

Search archives

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 ([ ]).