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National Geologic Map Database
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  • Usage in publication:
    • Clifton Forge sandstone member*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sandstone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Swartz, F.M., 1929, The Helderberg group of parts of West Virginia and Virginia, IN Shorter contributions to general geology, 1929: U.S. Geological Survey Professional Paper, 158-C, p. C27-C75.


Summary:

Clifton Forge sandstone member, middle member of Keyser limestone is named in west-central VA. Consists of calcareous sandstones and shaly sandstones with some arenaceous shale at Clifton Forge, Hot Springs, Gala, and other places in western VA. Thickness ranges from 66 to 102 ft; 66 ft at Clifton Forge). Intertongues with and finally replaces the upper limestone and Big Mountain shale members of Keyser. Overlies lower member of Keyser. Age is Early Devonian.

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


Map showing publication footprint
  • Usage in publication:
    • Clifton Forge Sandstone Member*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Appalachian basin
Publication:

Denkler, K.E., and Harris, A.G., 1988, Conodont-based determination of the Silurian-Devonian boundary in the Valley and Ridge province, northern and central Appalachians, IN Sando, W.J., ed., Shorter contributions to paleontology and stratigraphy: U.S. Geological Survey Bulletin, 1837-B, p. B1-B13.


Summary:

Conodont data and extrapolation from regional lithofacies relationships indicate that the Silurian-Devonian boundary lies within the uppermost Keyser Limestone (in the upper limestone member in west-central VA and east-central WV, and in the La Vale Member in northeast WV and central PA [and in MD by implication]). Therefore, Byers Island, Jersey Shore, Big Mountain Shale, and Clifton Forge Sandstone Members considered entirely Late Silurian.

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 ([ ]).