U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Lafayette Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Dolomite
    • Shale
    • Chert
  • AAPG geologic province:
    • Appalachian basin
Publication:

Markewicz, F.J., and Dalton, Richard, 1977, Stratigraphy and applied geology of the lower Paleozoic carbonates in northwestern New Jersey, IN Guidebook for the 42nd annual field conference of Pennsylvania geologists: Field Conference of Pennsylvania Geologists, no. 42, p. 10-12.


Summary:

Lafayette Member of Epler Formation named in Sussex Co., northwestern NJ. Described as black or gray fine- to medium-grained, laminated dolomite with shale and chert beds. Weathers orange gray. Breccia zones. Thickness ranges from 15 to 76 m. Overlies Big Springs Member of Epler Formation and underlies Beaver Run Member of Ontelaunee Formation. Age is Early Ordovician.

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


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

Dalton, Richard, 1989, Stratigraphy of the "Kittatinny Limestone", IN Grossman, I.G., ed., Paleozoic geology of the Kittatinny Valley and southwest Highlands area, New Jersey; field guide and proceedings: Geological Association of New Jersey Annual Field Conference, 6th annual meeting, October 20-21, 1989, v. 6, p. 59-94.


Summary:

The Lafayette Member at the top of the Epler Formation is similar to the Branchville Member at the base. Two recognizable units occur within the Lafayette. Lower unit is generally a fine- to medium-grained, black sparkly, massive bedded dolomite. Contains some beds of light- to medium-gray fine-grained dolomite with shaly laminations. Upper unit is a finely laminated, massive, light- to medium-gray, very fine to fine-grained, cream- to orange-gray weathered dolomite with laminations that stand out in relief on weathered surfaces. Contains some chert in beds or clots and zones of paleosolution breccia. Thickness of the Lafayette ranges from 50 to 250 ft. Contact with the overlying Ontelaunee Formation is transitional. Age is Early Ordovician.

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


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 03:23:59 PM MDT