U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Dupuyer Creek
Map showing publication footprint
  • Usage in publication:
    • Dupuyer Creek unit*
  • Modifications:
    • Named
  • Dominant lithology:
    • Limestone
  • AAPG geologic province:
    • Sweetgrass arch
Publication:

Nichols, K.M., 1984, Stratigraphy of the upper part of the Madison Group, Sawtooth Range, northwestern Montana, IN McBane, J.D., and Garrison, P.B., eds., 1984 field conference guidebook; northwest Montana and adjacent Canada: Montana Geological Society Annual Field Conference, 1984, p. 127-14.


Summary:

Named as the upper informal unit of the Mississippian Castle Reef Formation (redefined; revised) in the Sweetgrass arch. Named for North Fork Dupuyer Creek. No type locality designated. Is a sequence of dolomitized lime mudstone, skeletal packstone, and wackestone. Is gray, thin- to thick-bedded, massively parted. Corals, bryozoans, and brachiopods present in lower part. Ranges from 30 to 50 m thick. Is 65.1 m thick at Gibson Lake. Overlies Gateway Pass unit of Castle Reef. Underlies Ellis Group.

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 03:55:40 PM MDT