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

Field, R.M., 1919, The Middle Ordovician of central and south central Pennsylvania: American Journal of Science, 4th series, v. 48, p. 403-428.


Summary:

Named the Valentine formation for Valentine forge and small hamlet of Valentine near Bellefonte, Centre Co., central PA. Unit is 0 to 90 feet of "pure quarry rock" that shows no evidence of stratification. Occurs as lens in upper part of Stones River limestone. Overlies Carlim formation with sharp contact and underlies Center Hall [sic] formation with gradational contact. Unit thins to east, and its beds are successively replaced by upper beds of the Carlim, the younger of which appears to be synchronous with the Center Hall [sic] at Bellefonte. The Valentine is of Middle Ordovician (Chazyan) age.

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


Map showing publication footprint
  • Usage in publication:
    • Valentine member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Appalachian basin
Publication:

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


Summary:

Revised the Valentine to the Valentine member of the Curtin limestone. Unit is member in upper part of formation. Consists of thin yellow clay metabentonite at base; 25 feet of very light-gray, white-weathering, dense, laminated limestone; and about 66 feet of very light, white-weathering, dense, heavy-ledged, massive limestone at top. Thickness at Bell Mine, Bellefonte is 91 feet. Restricted to outcrop belts northwest of line from east of Lock Haven and Rebersburg to north of Millheim, Spring Mills, Lemont, and Stormstown in Clinton and Centre Cos. Overlies Valley View member of Curtin and unconformably underlies Nealmont limestone. The Valentine is of Middle Ordovician age.

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


Map showing publication footprint
  • Usage in publication:
    • Valentine Member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Appalachian basin
Publication:

Map showing publication footprint
  • Usage in publication:
    • Valentine Member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Appalachian basin
Publication:

Berg, T.M. (compiler), 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey State Map, 4th series, 1, scale 1:250,000


Summary:

Revised the Valentine to the Valentine Member of the Benner Formation in central PA. Unit is chemically pure, thick-bedded limestone (calcilutite) at top of formation.

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


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 ([ ]).