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National Geologic Map Database
Geologic Unit: Nealmont
Map showing publication footprint
  • Usage in publication:
    • Nealmont Limestone*
  • Modifications:
    • Revised
    • Areal extent
    • Age modified
  • AAPG geologic province:
    • Appalachian basin
Publication:

Ryder, R.T., 1992, Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Morrow County, Ohio, to Pendleton County, West Virginia, IN Evolution of sedimentary basins; Appalachian basin: U.S. Geological Survey Bulletin, 1839-G, p. G1-G25.


Summary:

In cross section E-E', in the subsurface of VA and WV, the Nealmont Limestone is used for bioclastic limestone and argillaceous micritic limestone. Usage is restricted to region near Allegheny structural front. Shown as a part of the Trenton Group. Age given is Middle and Late Ordovician (Rocklandian to Edenian) based on fossils. [This age assignment subsequently refuted by Ryder and others, 1992, USGS Bull.1839-K, p. K1-K32.]

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


Map showing publication footprint
  • Usage in publication:
    • Nealmont Limestone*
  • Modifications:
    • Age modified
  • AAPG geologic province:
    • Appalachian basin
Publication:

Ryder, R.T., Harris, A.G., and Repetski, J.E., 1992, Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Medina County, Ohio, through southwestern and south-central Pennsylvania to Hampshire County, West Virginia, IN Evolution of sedimentary basins; Appalachian basin: U.S. Geological Survey Bulletin, 1839-K, p. K1-K32.


Summary:

In section C-C' the Nealmont Limestone is everywhere Middle Ordovician (Rocklandian). [This refutes Ryder (1992, USGS Misc. Inv. Series Map, I-2264; 1992, USGS Bull.1839-G, p. G1-G25) where it was assigned a Middle and Late Ordovician age (Rocklandian through Edenian).]

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


Map showing publication footprint
  • Usage in publication:
    • Nealmont Limestone*
  • Modifications:
    • Age modified
    • Overview
  • AAPG geologic province:
    • Appalachian basin
Publication:

Ryder, R.T., 1992, Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Richland County, Ohio, to Rockingham County, Virginia: U.S. Geological Survey Miscellaneous Investigations Series Map, I-2264.


Summary:

In WV, Trenton Group consists of the Nealmont Limestone and the Dolly Ridge Formation following the usage of Perry (1972). Nealmont is here assigned a Middle and Late Ordovician age in accordance with Sweet and Bergstrom (1976). [This age assignment subsequently refuted by Ryder and others, 1992, USGS Bull.1839-K, p. K1-K32.]

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 ([ ]).