Unit Name: Spray River Group
Unit Type: Lithostratigraphic
Rank: Group
Status: Formal
Usage: Currently in use
Age Interval: Greisbachian - Carnian (251 - 216.5 ma)
Province/Territory: Alberta; British Columbia

Originator: Irish, 1965.

Type Locality:
In the Spray River gorge, at the south end of Sulphur Mountain, Banff National Park, Alberta, beginning in the first intermittent stream gully downstream from the junction of Goat Creek and Spray River, terminating at the south end of the Spray River gorge (Gibson, 1968). NTS 82O/4 Banff.

Distribution:
Occurs throughout the Rocky Mountain Foothills and eastern front ranges between the United States border and the Sukunka River area of northeastern British Columbia. Ranges in measured thickens from zero in the eastern foothills of Alberta to 853 m (2,798 ft) in the front ranges of west-central Alberta.

Locality Data:
Thickness(m): Minimum 0, Maximum 853.

Lithology:
Siltstone, silty shale, dolostone, limestone, solution or intraformational breccia, and minor sandstone and gypsum; divisible into 2 formations: a lower Sulphur Mountain (4 members) comprising a dark grey to rusty brown weathering sequence of siltstone, silty dolostone and silty, carbonaceous shale; and an upper Whitehorse (3 members) comprising a light weathering, multicolored, locally sandy sequence of limestone, dolostone and lesser calcareous and dolomitic sandstone and solution or intraformational breccia.

Relationship:
Unconformably overlies sandstone, chert and cherty dolostone of the Permian Ishbel Group or Fantasque Formation, or in some areas, cherty dolostone of the Mississippian Rundle Group. The Spray River Group is overlain disconformably by the Jurassic Fernie. It is stratigraphically equivalent to the Diaber Group and most of the Schooler Creek Group of the surface and subsurface foothills and Peace River Plains of northeastern British Columbia.

History:
Originally named Spray River Formation by Kindle (1924b); subsequently raised to group status by Irish (1965b).

Other Citations:
Gibson, 1968; Irish, 1965; Kindle, 1924.

References:
Gibson, D.W., 1968. Triassic stratigraphy between the Athabasca and Smoky Rivers of Alberta; Geological Survey of Canada, Paper 67-65.
Irish, E.J.W., 1965b. Geology of the Rocky Mountain Foothills, Alberta; Geological Survey of Canada, Memoir 334.
Kindle, E.M., 1924b. Standard Paleozoic section of Rocky Mountains near Banff, Alberta; Pan-American Geologist, vol. 42, no. 2 (September), pp. 113-124.

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: 02 Apr 2009