U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Prickly Pear member
  • Modifications:
    • First used
  • Dominant lithology:
    • Argillite
    • Sandstone
    • Conglomerate
Publication:

Fenton, C.L., and Fenton, M.A., 1937, Belt series of the north; stratigraphy, sedimentation, paleontology: Geological Society of America Bulletin, v. 48, no. 12, p. 1873-1970.


Summary:

First published use as middle member of Spokane formation of Piegan group (new) of Belt series. Is part of the western facies of the Spokane. Source of name not stated. No type locality designated. Areal limits not discussed. [Inadequate definition.] Overlies Greyson member (rank reduced) of Spokane. Underlies Empire member (rank reduced) of Spokane. Ranges from 3,000 to 5,000 ft thick. Composed of argillite interbedded with sandstone and lenticular conglomerate. Mud cracks and ripple marks common. Of pre-Cambrian age.

Source: GNU records (USGS DDS-6; Denver 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 04:06:13 PM MDT