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National Geologic Map Database
Geologic Unit: Shriver
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Map showing publication footprint
  • Usage in publication:
    • Shriver chert member, chert
  • Modifications:
    • Named
  • Dominant lithology:
    • Chert
    • Shale
  • AAPG geologic province:
    • Appalachian basin
Publication:

Swartz, C.K., Rowe, R.B., Schuchert, Charles, and Maynard, T.P., 1913, Lower Devonian in Maryland; Local sections of the Lower Devonian [of Maryland]; Correlation of the Lower Devonian, IN Swartz, C.K., and others, Lower Devonian [deposits of Maryland]: Maryland Geological Survey Systematic Report, p. 23-66, 96-190.


Summary:

Named the Shriver chert member of the Oriskany formation for Shriver Ridge near Cumberland, Allegany Co., western MD. Consists of dark siliceous shale with much black impure chert in nodules or layers of nodules. Thickness is 0 to 100 feet. Unit is basal member of Oriskany. Overlies the Becraft member of the Helderberg formation and underlies the Ridgeley sandstone [member]. Also is used as Shriver chert of Oriskany group. The Shriver is of Early Devonian age.

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


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

Dennison, J.M., 1963, Geology of the Keyser quadrangle, West Virginia-Maryland: West Virginia Geological and Economic Survey Geologic Map, GM-1, scale 1:24,000


Summary:

In southwestern MD and northeastern WV, the Shriver Chert is included in the Helderberg Group.

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


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

Hoskins, D.M., 1976, Geology and mineral resources of the Millersburg 15-minute quadrangle, Dauphin, Juniata, Northumberland, Perry, and Snyder Counties, Pennsylvania: Pennsylvania Geological Survey Topographic and Geologic Atlas, 4th series, 146, 38 p., scale 1:24,000


Summary:

In central PA, the Shriver is revised as the Shriver Member of the Old Port Formation. Overlies the Mandata Member and underlies the Ridgeley Member, both of the Old Port Formation. The Shriver is of Early Devonian age.

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


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

Monteverde, D.H., 1992, Bedrock geologic map of the Sussex County, New Jersey, portions of the Culvers Gap and Lake Maskenozha quadrangles: New Jersey Geological Survey Geologic Map, 92-1, scale 1:24,000


Summary:

Shriver Chert, middle unit of Oriskany Group, mapped in northwestern NJ. Unit is black to dark-gray siltstone and shale containing interbedded mottled, black and white chert and medium-gray thin-bedded, medium-crystalline limestone. Lower contact is gradational. Unit is only found in the southwestern part of the map area. Thickness ranges from 0 to 28 ft. Underlies Ridgeley Sandstone and overlies Glenerie Formation, both of Oriskany. Age is Early Devonian.

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


Map showing publication footprint
  • Usage in publication:
    • Shriver Chert*
  • 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:

Conodont biostratigraphy indicates that the Shriver Chert in the Winchester 30 X 60 minute quadrangle is of Early Devonian (late Lochkovian) age. Conodonts indicative of the P. PESAVIS Zone were recovered 12.5 m below the top of the formation.

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


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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 ([ ]).