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Map showing publication footprint
  • Usage in publication:
    • Helderberg Group*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Appalachian basin
Publication:

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

Smith, R.C., II, and Way, J.H., 1988, The Bald Hill Bentonite Beds; a Lower Devonian pyroclastic-bearing unit in the northern Appalachians: Northeastern Geology, v. 10, no. 3, p. 216-230.


Summary:

Newly named Bald Hill Bentonite Beds (A,B,C) have been identified within Helderberg strata in PA, NY, MD, WV, and VA. Beds A and B occur within the New Scotland Formation in PA and WV and within the correlative Corriganville Limestone in MD. Bed C occurs near the base of the overlying Mandata in all three states. In NY, Beds A, B, and C occur within the middle member of the Kalkberg Limestone. Bed A is presumably equivalent to Rickard's (1962) Kalkberg bentonite.

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


Map showing publication footprint
  • Usage in publication:
    • Helderberg Limestone*
  • Modifications:
    • Areal extent
  • AAPG geologic province:
    • Appalachian basin
Publication:

Lyons, P.C., 1989, Geologic Map of the Sissonville quadrangle, Kanawha, Jackson, and Putnam Counties, West Virginia: U.S. Geological Survey Geologic Quadrangle Map, GQ-1660, scale 1:24,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_1176.htm]


Summary:

Helderberg Limestone accepted for use in subsurface in vicinity of Sissonville quad, Kanawha, Jackson, and Putnam Cos, WV.

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


Map showing publication footprint
  • Usage in publication:
    • Helderberg Group*
  • Modifications:
    • Biostratigraphic dating
  • AAPG geologic province:
    • Appalachian basin
Publication:

Harris, A.G., Stamm, N.R., Weary, D.J., Repetski, J.E., Stamm, R.G., and Parker, R.A., 1994, Conodont color alteration index (CAI) map and conodont-based age determinations for the Winchester 30' x 60' quadrangle and adjacent area, Virginia, West Virginia, and Maryland: U.S. Geological Survey Miscellaneous Field Studies Map, MF-2239, 1 sheet, 40 p., scale 1:100,000 [http://ngmdb.usgs.gov/Prodesc/proddesc_294.htm]


Summary:

The Helderberg Group in the northern VA, northeastern WV, and western MD is of latest Silurian (Pridolian) and Early Devonian (Lochkovian) age based on conodont biostratigraphy. The Silurian-Devonian boundary occurs in the upper part of the Keyser Limestone. The Helderberg Group in this area consists of (ascending) the Keyser, New Creek, and Licking Creek Limestones.

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


Map showing publication footprint
  • Usage in publication:
    • Helderberg Group
  • Modifications:
    • Overview
    • Areal extent
  • AAPG geologic province:
    • Appalachian basin
Publication:

Rossbach, T.J., and Dennison, J.M., 1994, Devonian strata of Catawba syncline, near Salem, Virginia, IN Schultz, Art, and Henika, Bill, Fieldguides to Southern Appalachian structure, stratigraphy, and engineering geology: Virginia Polytechnic Institute and State University, Department of Geological Sciences Guidebook, Geological Society of America, Southeastern Section, annual meeting, Blacksburg, VA, April 7-9, 1994, no. 10, p. 95-126.


Summary:

Helderberg Group in the Catawba syncline is composed of 1 m of Clifton Forge Sandstone Member(?) of Keyser Formation and 8 m of Rocky Gap Sandstone consisting of calcitic, cross-bedded, shoaling marine sandstones containing some poorly preserved marine body fossils. Unconformably overlies the Silurian "Keefer" Sandstone (used informally here.) Age is Early Devonian only in this area.

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


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