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National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Plummer Hollow mudstone member
  • Modifications:
    • Named
  • Dominant lithology:
    • Mudstone
    • Siltstone
    • Sandstone
  • AAPG geologic province:
    • Appalachian basin
Publication:

Swartz, F.M., 1957, Silurian sediments and relationships at Susquehanna Gap in Blue or Kittatinny Mountain, five miles north of Harrisburg, Pennsylvania: Pennsylvania State University, Department of Geology Contributions, no. 57-3, 58 p., Revision of guide leaflet distributed at 14th Ann. Field Conf. Pennsylvania Geol., Harrisburg, PA, May 28-30, 1948. Reissued Sept. 25, 1958, with App. I, description of Susquehanna Gap section


Summary:

Plummer Hollow (new name) assigned as middle member of Juniata formation. Consists of red silty mudstone with interbeds of red siltstone and sandstone. Overlies East Waterford red sandstone and shale member (new) and underlies Run Gap red sandstone member. Thins eastward, and, at Waggoners Gap, beds lithologically referable to Plummer Hollow are not present and instead are about 360 ft of red sandstones of type that forms East Waterford member.

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


Map showing publication footprint
  • Usage in publication:
    • Plummer Hollow Member
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Appalachian basin
Publication:

Cotter, Edward, 1993, Overview of geology of central Pennsylvania, IN Driese, S.G., ed., Paleosols, paleoclimate and paleoatmospheric CO2; Paleozoic paleosols of central Pennsylvania: University of Tennessee, Department of Geological Sciences Studies in Geology, no. 22, p. 1-22.


Summary:

Subdivision of the Juniata Formation into three members in central PA is based largely on differences in the relative proportion of sandstone and mudrock. In the lowest East Waterford Member (lithofacies D of this report) red sandstones dominate over dark red mudrocks, and the sandstones are organized into beds that are medium to thick, cross-laminated, and laterally extensive and sheet-like. The middle Plummer Hollow Member (lithofacies E) contains more mudrock than sandstone, and the sandstone and mudrock are more or less regularly interbedded, in some places as fining-upward sequences. Abundant SKOLITHOS-like burrows filled with red mudstone occur in the sandstone. The upper Run Gap Member (lithofacies F) is largely red lithic wacke and underlies quartz arenite at the base of the Tuscarora Formation. Age is Ashgillian.

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 ([ ]).