U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Geologic Unit: Stonewall
Map showing publication footprint
  • Usage in publication:
    • Stonewall formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Williston basin
Publication:

Baillie, A.D., 1951, Devonian geology of Lake Manitoba-Lake Winnipegosis area: Manitoba Department of Mines and Natural Resources, Mines Branch Publication, no. 49-2.


Summary:

Upper contact revised in that the upper 0-25 ft thick dolostone formerly assigned to the Stonewall is removed from it and named Ashern formation. Ashern is separated from the Silurian Stonewall by an erosional unconformity. Report area lies in Lake Manitoba area, Manitoba, CN in the Williston basin.

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


Map showing publication footprint
  • Usage in publication:
    • Stonewall formation
  • Modifications:
    • Revised
  • AAPG geologic province:
    • Williston basin
Publication:

Porter, J.W., and Fuller, J.G.C.M., 1959, Lower Paleozoic rocks of northern Williston basin and adjacent areas: American Association of Petroleum Geologists Bulletin, v. 43, no. 1, p. 124-189. [Available online, with subscription, from AAPG archives: http://www.aapg.org/datasystems or http://search.datapages.com]


Summary:

Assigned to Bighorn group as uppermost member in Williston basin. Ross (1957) included Stonewall in his Stony Mountain formation. Bighorn now consists of (ascending) Red River, Stony Mountain, and Stonewall formations. Cross sections; table of nomenclature. Isopach map of combined Stonewall and Gunton member of Stony Mountain. All of unit arbitrarily assigned Late Ordovician age; fauna dated at type as Late Ordovician by Stearn (1953, GSA Bull., v. 64, p. 1477-78; 1956, Geol. Survey, Canada, Mem. 281), taken from lower part of Stonewall as upper part not exposed. Prior to Stearn, unit considered Silurian.

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 04:10:04 PM MDT