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Geologic Unit: Belpre
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Map showing publication footprint
  • Usage in publication:
    • Belpre Ash Bed*
  • Modifications:
    • Named
  • Dominant lithology:
    • Ash
  • AAPG geologic province:
    • Appalachian basin
Publication:

Roen, J.B., and Hosterman, J.W., 1982, Misuse of the term "bentonite" for ash beds of Devonian age in the Appalachian basin: Geological Society of America Bulletin, v. 93, no. 9, p. 921-925.


Summary:

The Belpre bentonite of Collins (1979) is here named the Belpre Ash Bed and accepted for USGS usage. In the Appalachian basin the bed is near the base of the black shale beds of the Olentangy Shale in the subsurface of eastern OH and eastern KY; in the Rhinestreet Shale Member of the West Falls Formation in northwestern PA, western WV, southwestern VA, and northeastern TN, all in the subsurface; and at the surface in southwestern VA and northeastern TN in that part of the Chattanooga Shale that is equivalent to the Rhinestreet Shale Member in the subsurface. The Belpre is composed of Md illite, kaolinite, illite-smectite mixed layer clay, quartz, and biotite. Volcanic ash beds of Devonian age in the Appalachian basin are mineralogically and physically unlike bentonite as defined originally and by industry, which requires that smectite be the principal constituent. Thickness ranges from 0.5 to 30 cm. Age is Late Devonian.

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


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

Dennison, J.M., Filer, J.K., and Rossbach, T.J., 1994, Upper Devonian outcrop stratigraphy along the Appalachian basin margin in southeastern West Virginia and southwestern Virginia and implications for hydrocarbon exploration, IN Schultz, A.P., and Rader, E.K., eds., Studies in eastern energy and the environment: Virginia Division of Mineral Resources Publication, no. 132, p. 43-49., See also 1994 AAPG Eastern Section Spec. Vol. (Williamsburg, VA, Sept. 19-21, 1993)


Summary:

Cross section between Norton and Asberrys, VA, in the Clinch Mountain outcrop belt shows more detailed divisions of Chattanooga Shale than previously indicated. Base of Chattanooga is marked by Belpre Ash, which occurs within the Rhinestreet Shale Member, and Center Hill Ash occurs within the Java Shale Member.

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 ([ ]).