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

Epstein, A.G., Epstein, J.B., Spink, W.J., and Jennings, D.S., 1967, Upper Silurian and Lower Devonian stratigraphy of northeastern Pennsylvania, New Jersey, and southeasternmost New York: U.S. Geological Survey Bulletin, 1243, 74 p., See also Epstein, J.B., and Epstein, A.G., 1967, "Geology in the region of the Delaware to Lehigh Water Gaps," Field Conf. Pennsylvania Geol., no. 32


Summary:

Pg. 2 (fig. 1), 34-35, 36 (fig. 11), 55-57, 65-67, pl. 1. Minisink Limestone included in Helderberg Group in New Jersey and Pennsylvania. Age is Early Devonian.

Source: Changes in stratigraphic nomenclature, 1967 (USGS Bull. 1274-A, p. A9).


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, 1 sheet, 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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Asterisk (*) indicates published by U.S. Geological Survey authors.

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