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Geologic Unit: Belknap
Map showing publication footprint
  • Usage in publication:
    • Belknap limestone member
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Bend arch
Publication:

Plummer, F.B., and Moore, R.C., 1922, Pennsylvanian stratigraphy of north-central Texas: Journal of Geology, v. 30, no. 1, p. 18-42.


Summary:

Pg. 24, 31, 39; see also Univ. Texas Bull., no. 2132, p. 161-166. Belknap limestone member of Harpersville formation. Lies 30 to 50 feet below top of formation. Is traceable a long distance.

Source: US geologic names lexicon (USGS Bull. 896, p. 150).


Map showing publication footprint
  • Usage in publication:
    • Belknap limestone lentil
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Bend arch
Publication:

Plummer, F.B., and Moore, R.C., 1922, Stratigraphy of the Pennsylvanian formations of north-central Texas: University of Texas Bulletin, no. 2132, 237 p.


Summary:

Pg. 161-166; see also Jour. Geol., v. 30, p. 24, 31, 39, 1922. Belknap limestone lentil of Harpersville formation. Yellow to buff limestone, nodular, 2 to 4 feet thick, locally very fossiliferous. Lies 60 to 80 feet above Crystal Falls limestone lentil of Harpersville formation and 30 to 50 feet below top of formation. [Age is Pennsylvanian.]
Named from old Fort Belknap, Young Co., Bravos River region, central northern TX; typical exposures in vicinity of Newcastle, Young Co., where it lies above the workable coal bed. [Absent from Colorado River Valley.]

Source: US geologic names lexicon (USGS Bull. 896, p. 150).


Map showing publication footprint
  • Usage in publication:
    • Belknap limestone member*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Bend arch
Publication:

Keroher, G.C., 1966, [Selected U.S. Geologic Names Committee remarks], IN Keroher, G.C., 1966, Lexicon of geologic names of the United States for 1936-1960: U.S. Geological Survey Bulletin, 1200, pts. 1-3, 4341 p., (3 volumes)


Summary:

Belknap limestone member of Thrifty formation. The USGS currently [ca. 1966] classifies the Belknap as a member of the Thrifty Formation. Term Harpersville abandoned. Recognized in central northern Texas. Age is Late Pennsylvanian.

Source: US geologic names lexicon (USGS Bull. 1200, p. 283).


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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