Spray River Group
| Spray River Group | |
|---|---|
| Stratigraphic range: | |
| File:Bow River-27527-3.jpg Spray River strata exposed at Bow Falls | |
| Type | Group |
| Sub-units | Whitehorse Formation Sulphur Mountain Formation |
| Underlies | Fernie Formation |
| Overlies | Ishbel Group |
| Thickness | Up to about 850 m (2,790 ft)[1] |
| Lithology | |
| Primary | Siltstone, dolomite |
| Other | Limestone, sandstone |
| Location | |
| Coordinates | Lua error in Module:Coordinates at line 489: attempt to index field 'wikibase' (a nil value). |
| Region | Alberta |
| Country | Canada |
| Type section | |
| Named for | Spray River |
| Named by | E.M. Kindle[2] |
The Spray River Group is a stratigraphic unit of Triassic age. It is present on the western edge of the Western Canada Sedimentary Basin in the foothills and Rocky Mountains of western Alberta. It was originally described as the Spray River Formation by E.M. Kindle in 1924[2] and was later raised to group status.[3] Its type section is located in the Spray River gorge at the southern end of Sulphur Mountain.[3]
The Spray River Group includes marine fossils[4] from the Triassic period.[5]
Stratigraphy and lithology
[edit | edit source]The Spray River Group was deposited on the continental shelf along the western margin of the North American craton. It is subdivided into two formations: the Sulphur Mountain Formation at the base and the Whitehorse Formation at the top.[3]
The Sulphur Mountain Formation consists of dolomitic and calcitic siltstones, silty dolomites, dolomitic limestones, and very fine-grained dolomitic quartz sandstones. The Whitehorse Formation consists of dolomites, dolomitic siltstones and limestones, and dolomitic and calcitic quartzites.[1][5]
See also
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References
[edit | edit source]- ^ a b Glass, D.J. (editor) 1997. Lexicon of Canadian Stratigraphy, vol. 4, Western Canada including eastern British Columbia, Alberta, Saskatchewan and southern Manitoba. Canadian Society of Petroleum Geologists, Calgary, 1423 p. on CD-ROM. Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value)..
- ^ a b Kindle, E.M. 1924. Standard Palaeozoic section of the Rocky Mountains near Banff, Alberta. Pan American Geologist, vol. 42, no. 2.
- ^ a b c Gibson, D.W. 1974. Triassic rocks of the southern Canadian Rocky Mountains. Geological Survey of Canada, Bulletin 230, 65 p.
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).