Spray River Group

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]

Spray River Group
Stratigraphic range:
Spray River strata exposed at Bow Falls
TypeGroup
Sub-unitsWhitehorse Formation
Sulphur Mountain Formation
UnderliesFernie Formation
OverliesIshbel Group
ThicknessUp to about 850 m (2,790 ft)[1]
Lithology
PrimarySiltstone, dolomite
OtherLimestone, sandstone
Location
Coordinates51°5′24″N 115°31′35″W
Region Alberta
Country Canada
Type section
Named forSpray River
Named byE.M. Kindle[2]

The Spray River Group includes marine fossils[4] from the Triassic period.[5]

Stratigraphy and lithology

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

References
  1. 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. ISBN 0-920230-23-7.
  2. Kindle, E.M. 1924. Standard Palaeozoic section of the Rocky Mountains near Banff, Alberta. Pan American Geologist, vol. 42, no. 2.
  3. Gibson, D.W. 1974. Triassic rocks of the southern Canadian Rocky Mountains. Geological Survey of Canada, Bulletin 230, 65 p.
  4. Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
  5. AAPG Datapages: M. Shafiuddin. "Spray River Formation Near Banff and Cadomin". Retrieved July 12, 2015.
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