U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Pamunkey formation*
  • Modifications:
    • Named
  • Dominant lithology:
    • Sand
    • Clay
  • AAPG geologic province:
    • Atlantic Coast basin
Publication:

Darton, N.H., 1891, Mesozoic and Cenozoic formations of eastern Virginia and Maryland: Geological Society of America Bulletin, v. 2, p. 431-450.


Summary:

Named the Pamunkey formation for the extensive exposures on the Pamunkey River, VA. Unit consists of a homogeneous sheet of fine-grained materials, mainly glauconitic sands, usually profusely fossiliferous. Locally includes a few beds of clay, secondary limestones, and at base some gravels. Thickness 150 feet. Unconformably underlies Chesapeake formation (group) and unconformably overlies the Cretaceous Severn formation. The Pamunkey is considered representative of the Eocene.

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


Map showing publication footprint
  • Usage in publication:
    • Pamunkey group
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Atlantic Coast basin
Publication:

Clark, W.B., and Martin, G.C., 1901, The Eocene deposits of Maryland, IN Clark, W.B., and others, Eocene: Maryland Geological Survey Systematic Report, 331 p.


Summary:

Raised the Pamunkey to group status and divided it into the Nanjemoy formation above and the Aquia formation below. Unconformably underlies Chesapeake group and unconformably overlies Cretaceous deposits.

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


Map showing publication footprint
  • Usage in publication:
    • Pamunkey Group*
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Atlantic Coast basin
Publication:

Ward, L.W., 1984, Stratigraphy of outcropping Tertiary beds along the Pamunkey River, central Virginia coastal plain, IN Ward, L.W., and Krafft, Kathleen, eds., Stratigraphy and paleontology of the outcropping Tertiary beds in the Pamunkey River region: Atlantic Coastal Plain Geological Association Field Trip Guidebook, [19th] Annual Field Conference, October 6-7, 1984, [no. 19], 280 p., See also SEPM, North Amer. Micropaleo. Section, Field Trip Gdbk., 1985


Summary:

Included the previously overlying Chickahominy Formation in the Pamunkey Group. The Chickahominy is of late Eocene age and therefore extends the age of the Pamunkey Group.

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


Map showing publication footprint
  • Usage in publication:
    • Pamunkey Group
  • Modifications:
    • Overview
  • AAPG geologic province:
    • Atlantic Coast basin
Publication:

Rader, E.K., and Evans, N.H., 1993, Geologic map of Virginia; expanded explanation: Virginia Division of Mineral Resources, 80 p.


Summary:

Pamunkey Group and its formations--Brightseat Formation, Aquia Formation, Marlboro Clay, Nanjemoy Formation, Piney Point Formation and Chickahominy Formation--mapped together with Old Church Formation and unnamed lower Oligocene beds as lower Tertiary deposits. Formations within Pamunkey range from early Paleocene to late Eocene.

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


Search archives

For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

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

"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 03:28:33 PM MDT