- Usage in publication:
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- Nisku formation
- Modifications:
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- Revised
- AAPG geologic province:
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- Williston basin
Summary:
Raised in rank from basal member [of Winterburn formation] to Nisku formation, upper formation of the newly named Saskatchewan group. Is present throughout report area from SA into MB, CN and south into northern MT, ND, and northwest SD, US in the Williston basin. Consists of fragmental fossiliferous (corals, bryozoa, stromatoporoids, algae) limestone probably of a reef complex and some anhydrite as vug fillings and as massive beds (10 to 20 ft thick) interbedded with dolostone. Varies little in thickness probably rarely more than 150 ft thick. Overlies unnamed part of Saskatchewan. Underlies Lyleton formation, basal formation of Qu'appelle group (new). Well log descriptions; correlation charts; areal extent map of Saskatchewan group. Of Late Devonian 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 ([ ]).