Unit Name: Schooler Creek Group
Unit Type: Lithostratigraphic
Usage: Currently in use
Age Interval: Ladinian - Norian (237 - 203.6 ma)
Province/Territory: British Columbia
Originator: McLearn, F.H., 1921; emended by Hunt, A.D. and Ratcliff, J.D., 1959.
Subsurface Peace River Plains in northeastern British Columbia, in two wells: a) Pacific Fort St. John No. 16, in 2-18-84-19W6M between 1,257.9 and 1,565.2 m (4,127 and 5,168 ft); and b) Southern Production No. B-14-1, in 1-12-84-23W6M, between 1,524.0 and 1,569.1 m (5,000 and 5,148 ft). No specific type surface locality except for the area of Peace River Foothills along Peace River (Williston Lake Reservoir) between Aylard and Pardonet Creeks (McLearn, 1921, 1947). NTS Maps 94B/2 Jones Peak and 94B/3 Mount Brewster.
The Schooler Creek Group is recognized throughout the Rocky Mountain Foothills and subsurface Peace River Plains between the Sukunka and Liard River area of northeastern British Columbia (Gibson, 1975). The Schooler Creek Group attains an approximate maximum thickness of 730 m (2,394 ft) near the headwaters of Eleven Mile Creek, south of Williston Lake, and thins to zero towards the east and northeast.
Field exposures comprise six formations which, in ascending order are: the Halfway or Liard - dolomitic to calcareous sandstone, with lesser beds of siltstone, dolostone and skeletal limestone; Charlie Lake - intercalated dolomitic to calcareous sandstone, siltstone, sandy limestone, dolostone and minor intraformational and/or solution breccia; Ludington - a lateral equivalent of the Charlie Lake, Baldonnel and Liard formations, comprising medium to pale grey weathering, dolomitic to calcareous siltstone, sandstone and silty to sandy bioclastic limestone; Baldonnel - a pale grey to brownish grey weathering, cliff forming limestone and dolostone, with rare siltstone and very fine-grained sandstone; Pardonnet - a dark grey to brownish grey weathering, very carbonaceous-argillaceous limestone, silty limestone, calcareous and dolomitic siltstone, and minor shale; Bocock - light grey to yellowish brown weathering, medium- to thick-bedded, aphanitic to coarsely crystalline to bioclastic limestone. In the subsurface the Schooler Creek Group comprises four formations: Halfway - fine- to medium-grained sandstone, finely crystalline dolostone and dolostone coquinas; Charlie Lake - interbedded siliciclastics, carbonates and evaporites; Baldonnel - dolostone and minor limestone; and Pardonet - argillaceous siltstone, silty limestone and shale. The Pardonet of the subsurface is confined mainly to the foothills.
The Schooler Creek is unconformably overlain by black shale of the Jurassic Fernie Formation, or sandstone and shale of the Lower Cretaceous Bullhead and Fort St. John groups, and conformably and gradationally overlies siltstones and shales of the Toad Formation. In the subsurface plains it conformably and disconformably overlies the Toad or Doig formations (Hunt and Ratcliffe, 1959; Stott, 1967). The Schooler Greek Group is equivalent to the Whitehorse and upper Sulphur Mountain formations to the south.
Originally named Schooler Creek Formation by McLearn (1921), to include all Upper Triassic strata in the Peace River Foothills. The name was later extended to include strata in the Sikanni Chief and Halfway River area to the north. McLearn (1947) recommended that the formation be raised to group status, which subsequently was done by Hunt and Ratcliffe (1959) for strata in the Peace River subsurface. Colquhoun (1962) used the name Schooler Creek Group to include surface strata comprising the Halfway, Charlie Lake, Baldonnel and Pardonet formations. Gibson (1971, 1975) recognized two new formations, the Ludington and Bocock in the Schooler Creek Group between Pine Pass and Sikanni Chief River.
Colquhoun, 1962; Gibson, 1971, 1975; Hunt and Ratcliffe, 1959; McLearn, 1921, 1947; Stott, 1967.
Source: CSPG Lexicon of Canadian Stratigraphy, Volume 4, western Canada, including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba; D.J. Glass (editor)
Contributor: D.W. Gibson
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 29 Apr 2003