Schooler Creek Group Stratigraphic range: Ladinian to Norian |
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Type | Geological formation |
Sub-units | Bocock Formation, Pardonet Formation, Baldonnel Formation, Ludington Formation, Charlie Lake Formation, Halfway Formation |
Underlies | Fernie, Bullhead, Fort St. John Group |
Overlies | Toad Formation, Doig Formation |
Thickness | up to 730 feet (220 m)[1] |
Lithology | |
Primary | Limestone, dolostone |
Other | Siltstone, shale, evaporite |
Location | |
Named by | F.H. McLearn, 1921 |
Region | Alberta, British Columbia |
Country | Canada |
The Schooler Creek Group is a stratigraphical unit of Ladinian to Norian age in the Western Canadian Sedimentary Basin.
It was named for Schooler Creek, a left tributary of the Williston Lake, and was first described north-west of Fort St. John in the Pacific Fort St. John No. 16 and Southern Production No. B-14-1 wells by F.H. McLearn in 1921.[2]
Contents |
The Schooler Creek Group is composed of limestone and dolostone, with subordinate siltstone, shale and evaporite.
The Schooler Creek Group occurs in outcrops in the Canadian Rockies foothills, and a surface type locality for part of the Group can be found along Williston Lake. In the sub-surface it extends east and north from the Liard River throughout the Peace River Country. It reaches a maximum thickness of 730 feet (220 m) in the foothills.
The Pardonet Formation only occurs in the Canadian Rockies, and has its type locality at Pardonel Hill, on the south shore of the Williston Lake at .
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.
The Schooler Creek Group has the following sub-divisions from top to base:
Sub-unit | Age | Lithology | Thickness | Reference |
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Bocock Formation | late Norian | aphanitic crystalline and bioclastic limestone | 63 metres (210 ft) | [3] |
Pardonet Formation | Norian | limestone, silty limestone, siltstone, rare shale | 137 metres (450 ft) | [4] |
Baldonnel Formation | Carnian | limestone, dolostone, with interbeds of siltstone and very fine grained sandstone | 146 metres (480 ft) | [5] |
Ludington Formation | Carnian | dolomitic and calcareous siltstone, sandstone, bioclastic limestone | 500 metres (1,640 ft) | [6] |
Charlie Lake Formation | Carnian | carbonate and evaporite | 550 metres (1,800 ft) | [7] |
Halfway Formation | early Ladinian to Carnian | sandstone, with interbeds of siltstone, dolostone and limestone | 416 metres (1,360 ft) | [8] |