Schooler Creek Group
Template:Short description Template:Infobox Rockunit The Schooler Creek Group is a stratigraphic unit of Middle to Late Triassic (Ladinian to Norian) age in the Western Canadian Sedimentary Basin. It is present in northeastern British Columbia. It was named for Schooler Creek, a left tributary of Williston Lake, and was first described in two oil wells (Pacific Fort St. John No. 16 and Southern Production No. B-14-1) northwest of Fort St. John, by F.H. McLearn in 1921.[1] Exposures along Williston Lake serve as a type locality in outcrop.
Lithology
The Schooler Creek Group is composed of limestone and dolomite, with subordinate siltstone, shale, sandstone, and evaporite minerals such as gypsum and anhydrite.
Distribution
The Schooler Creek Group outcrops in the foothills of the northern Canadian Rockies in northeastern British Columbia, where it reaches its maximum thickness of Script error: No such module "convert".. In the subsurface, it extends throughout the plains of the Peace River Country. The Pardonet Formation has its type locality at Pardonet Hill, on the south shore of the Williston Lake at Script error: No such module "Coordinates"..
Relationship to other units
The Schooler Creek Group is unconformably overlain by the Fernie shale, or by the Bullhead or Fort St. John Group. It conformably overlies the Toad Formation or the Doig Formation.
Subdivisions
The Schooler Creek Group has the following sub-divisions from top to base:
| Sub-unit | Age | Lithology | Thickness | Reference |
|---|---|---|---|---|
| Bocock Formation | late Norian | aphanitic crystalline and bioclastic limestone | Script error: No such module "convert". | [2] |
| Pardonet Formation | Norian | limestone, silty limestone, siltstone, rare shale | Script error: No such module "convert". | [3] |
| Baldonnel Formation | Carnian | limestone, dolomite, with interbeds of siltstone and very fine grained sandstone | Script error: No such module "convert". | [4] |
| Ludington Formation | Carnian | dolomitic and calcareous siltstone, sandstone, bioclastic limestone | Script error: No such module "convert". | [5] |
| Charlie Lake Formation | Carnian | aeolian sandstones, limestone, dolomite and evaporite minerals such as anhydrite. Deposited in a series of sand dunes and sabkah environments similar to the modern Coastal Ergs of Namibia. | Script error: No such module "convert". | [6][7][8][9] |
| Halfway Formation | early Ladinian to Carnian | sandstone, with interbeds of siltstone, dolomite and limestone | Script error: No such module "convert". | [10] |
References
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- ↑ McLearn, F.H., 1921. Mesozoic of upper Peace River, British Columbia Geological Survey of Canada, Summary Report 1920, Part B, p. 1-6.
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- ↑ Higgs, R. "Sedimentology and Petroleum Geology of the Artex Member (Charlie Lake Formation), Northeast British Columbia [Abstract]." Bulletin of Canadian Petroleum Geology 38.1 (1990): 166-166.
- ↑ Arnold, K.J. Origin and distribution of aeolian sandstones in the Triassic Charlie Lake Formation, northeastern British Columbia. 1996.
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