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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
Publication:

Donaldson, A.C., 1969, Stratigraphic framework of stromatolites in Lower Ordovician of central Appalachians, IN Pre-convention; Some Appalachian coals and carbonates; models of ancient shallow-water deposition: West Virginia Geological and Economic Survey [Field Trip Guidebook], Geological Society of America, [82nd] annual meeting, Atlantic City, NJ, p. 357-384.


Summary:

Revised the Larke to the Larke Formation and geographically extended it to northern WV. Unit correlates with the Stonehenge Limestone to the south.

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


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

Rickard, L.V., 1973, Stratigraphy and structure of the subsurface Cambrian and Ordovician carbonates of New York: New York State Museum and Science Service Map and Chart Series, 18, 10 sheets, 26 p., scale 1:1,000,000


Summary:

Geographically extended the Larke Formation to NY.

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 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 ([ ]).

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