U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Leyden
Search archives
Map showing publication footprint
  • Usage in publication:
    • Leyden argillite*
  • Modifications:
    • Named
  • Dominant lithology:
    • Argillite
    • Schist
  • AAPG geologic province:
    • New England province
Publication:

Emerson, B.K., 1898, Holyoke folio, Massachusetts-Connecticut: U.S. Geological Survey Geologic Atlas of the United States Folio, GF-50, 8 p., scale 1:125,000


Summary:

Named the Leyden argillite in central MA and southeastern VT for Leyden Township, Franklin Co., MA. Consists of dark, coarse slate or fine-grained mica schist with chiastolitic contact zone at base. Thickness is 300 feet. Overlies Conway schist. Unit is widespread in VT. The Leyden is of Silurian(?) age.

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


Map showing publication footprint
  • Usage in publication:
    • Leyden Argillite
  • Modifications:
    • Age modified
    • Biostratigraphic dating
  • AAPG geologic province:
    • New England province
Publication:

Boucot, A.J., and Johnson, J.G., 1967, Appalachian province Early Devonian palaeogeography and brachiopod zonation, IN Oswald, D.H., ed., International symposium on the Devonian System [proceedings]: Alberta Society of Petroleum Geologists, Calgary, Alberta, 1967, v. 2, p. 1255-1267.


Summary:

The age of the Leyden Argillite is changed to Early Devonian based on brachiopods.

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 03:24:29 PM MDT