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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Schaefferstown member
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Gray, Carlyle, Geyer, A.R., and McLaughlin, D.B., 1958, Geologic map of the Richland quadrangle, Pennsylvania: Pennsylvania Geological Survey Topographic and Geologic Atlas, 4th series, 167d, scale 1:24,000


Summary:

Named the Schaefferstown member of the Conococheague formation for Schaefferstown, Lebanon Co., southeastern PA. Unit is limestone sequence that stratigraphically overlies the Snitz Creek member; top is drawn at base of first bed of white to pinkish-gray, crystalline limestone of overlying Millbach member. Consists of medium-light- to medium-gray limestone with distinct shaly bands and laminae; rock is thick bedded in fresh exposures; some pinkish-gray limestone beds near base; shaly bands and laminae are carbonaceous and make member particularly susceptible to flowage. Thickness probably 200 to 300 feet; partial type section is 68 feet with neither top nor base exposed. The Schaefferstown is of Late Cambrian age.

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


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

Gray, Carlyle (compiler), 1960, Geologic map of Pennsylvania: Pennsylvania Geological Survey, 4th series, scale 1:250,000


Summary:

Raised the Schaefferstown to the Schaefferstown formation of the Conococheague group in southeastern PA.

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


Map showing publication footprint
  • Usage in publication:
    • Schaefferstown Formation*
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Appalachian basin
Publication:

Meisler, Harold, 1963, Hydrogeology of the carbonate rocks of the Lebanon Valley, Pennsylvania: Pennsylvania Geological Survey Water Resource Report, 4th series, no. 18, 81 p., (incl. geologic map, scale 1:24,000)


Summary:

The Schaefferstown Formation of the Conococheague Group consists of light-gray to gray limestone containing shaly bands and laminae. Patches and thin beds of gray calcarenite are characteristic of the member. Some pinkish-gray limestone occurs near base. Thickness is about 200 to 300 feet. Overlies the Snitz Creek Formation and underlies the Millbach Formation, both of the Conococheague Group.

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


Map showing publication footprint
  • Usage in publication:
    • Schaefferstown Formation
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Appalachian basin
Publication:

Berg, T.M. (compiler), 1980, Geologic map of Pennsylvania: Pennsylvania Geological Survey State Map, 4th series, 1, scale 1:250,000


Summary:

The Schaefferstown Formation in the Lebanon Valley sequence of the Great Valley consists of gray, thin-bedded limestone containing siliceous and argillaceous laminae. Overlies the Snitz Creek Formation and underlies the Millbach Formation. On State map, the Schaefferstown is mapped with the Millbach 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 ([ ]).