Unit Name: Cold Lake Formation
Unit Type: Lithostratigraphic
Rank: Formation
Status: Formal
Usage: Currently in use
Age Interval: PROBABLE Eifelian (397.5 - 391.8 ma)
Age Justification: No fauna has been found in the Cold Lake Formation, but stratigraphic equivalents in the western District of Mackenzie contain a fauna of Eifelian age.
Province/Territory: Alberta; British Columbia; Northwest Territories; Saskatchewan

Originator: Sherwin, D.F., 1962.

Type Locality:
Canadian Seaboard 10-13-60-4W4M, in Alberta, between 982.1 and 1,037.8 m (3,222 and 3,405 ft). Name derived from White Rose C & E Cold Lake 7-22-66-1W4M, between 811.7 and 863.2 m (2,663 and 2,832 ft).

The Cold Lake Formation extends from the vicinity of the Meadow Lake escarpment (approx. 54 deg 31'N, 105 deg 40'W) through northwestern Saskatchewan and eastern Alberta to the south flank of the Peace River-Athabasca Arch. It is present north of the arch, where it extends across northern Alberta into northeastern British Columbia east of the Fort Nelson Arch, and into southern District of Mackenzie, east and north of the Tathlina Arch. In District of Mackenzie it is considered a member of the Mirage Point Formation. It is up to 56 m (184 ft) thick in the eastern Alberta Basin, 79 m (259 ft) in northern Alberta, and 117 m (389 ft) in southern District of Mackenzie (Meijer Drees, pers. comm., 1979).

Halite, with thin basal red calcareous to dolomitic shale, 6 m (20 ft) thick in type welI .

The Cold Lake overlies the Ernestina Lake Formation, is overlain by the Contact Rapids Formation in western Saskatchewan and eastern Alberta, and by the Chinchaga Formation in northern Alberta, northeastern British Columbia and southern District of Mackenzie. In general the unit grades into Basal Red Beds of the Elk Point Group around the margins of the basin and across the Peace River-Athabasca arch. It grades into coarse clastics on the flank of the Peace River and Tathlina arches that are referred to as Elk Point Sands or Granite Wash (Barss et al., 1970). In central Alberta it grades westward into red, dolomitic shales overlying the Ernestina Lake Formation which are included in the Contact Rapids Formation (Sherwin, 1962). East and north of the Tathlina Arch the Cold Lake is considered a member of the Mirage Point Formation (Meijer Drees, pers. comm., 1979), which passes northwestward into anhydrite and dolomites of the Bear Rock Formations and thence into carbonates of the Arnica and Gossage formations. It is probably equivalent to part of the Cedared and Burnais formations of southwestern British Columbia.

Other Citations:
Barss, Copland and Ritchie, 1970; Bassett and Stout, 1967; Douglas, 1970; Grayston, Sherwin and Allan, 1964; Hriskevich, 1967, 1968; Law, 1971; Sherwin, 1962.

Source: CSPG Lexicon of Canadian Stratigraphy, Volume 4, western Canada, including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba; D.J. Glass (editor)
Contributor: H.R. Balkwill; P.A. Monahan; L.D. Grayston
Entry Reviewed: Yes
Name Set: Lithostratigraphic Lexicon
LastChange: 14 May 2004