Coalspur Formation

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Coalspur Formation
Stratigraphic range: Maastrichtian to Danian
Type Formation
Unit of Saunders Group
Sub-unitsCoalspur coal zone,
Entrance conglomerate
Underlies Paskapoo Formation
Overlies Brazeau Formation
ThicknessUp to about 550 metres (1,800 ft)
Lithology
Primary Sandstone, siltstone, shale
Other Coal, conglomerate, bentonite
Location
Coordinates 53°00′N116°48′W / 53.0°N 116.8°W / 53.0; -116.8
Approximate paleocoordinates 60°36′N91°36′W / 60.6°N 91.6°W / 60.6; -91.6
RegionFlag of Alberta.svg  Alberta
CountryFlag of Canada (Pantone).svg  Canada
Extent Western Canada Sedimentary Basin
Type section
Named for Coalspur, Alberta
Named byB.R. MacKay [1]
Year defined1949
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Coalspur Formation (Canada)
Canada Alberta relief location map - transverse mercator proj.svg
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Coalspur Formation (Alberta)

The Coalspur Formation is an Upper Cretaceous to lower Palaeocene stratigraphic unit of the Western Canada Sedimentary Basin in the foothills of southwestern Alberta. [2] Its deposition spanned the time interval from latest Cretaceous (Maastrichtian) to early Palaeocene, and it includes sediments that were deposited before, during, and after the Cretaceous-Paleogene (K-Pg) extinction event. It includes the economically important coal deposits of the Coalspur Coal Zone, as well as nonmarine plant and animal fossils.

Contents

Lithology

The sediments of the Coalspur Formation were eroded from the Canadian Cordillera, and were transported eastward by river systems and deposited in fluvial channel and floodplain environments. [2] The formation consists primarily of sandstones and siltstones, interbedded with mudstones and minor amounts of bentonite. Thick coal seams are present locally in the upper portion of the formation, especially in the Alberta Coal Branch area southeast of Hinton, Alberta. Near the Athabasca River the base consists primarily of conglomerate and is known as the Entrance Conglomerate. [3]

Stratigraphy and age

The Coalspur Formation is part of the Saunders group. The K-Pg boundary has been identified within the formation at the base of the lowermost coal seam (the Mynheer seam), based on changes in the fossil pollen assemblage and the presence of an iridium anomaly. [4] The boundary subdivides the Coalspur Formation into an upper member called the Coalspur coal zone which is of early Paleocene age, and an unnamed lower member of latest Cretaceous age. [3]

Thickness and distribution

The Coalspur Formation is present in the Alberta foothills from south of the Wapiti River to the North Saskatchewan River. [5] The formation is estimated to reach thicknesses of up to about 550 metres (1,800 ft), and the Coalspur coal zone is about 120 metres (390 ft) to 200 metres (660 ft) thick. [3]

Relationship to other units

The Coalspur Formation rests abruptly on the Brazeau Formation and is overlain abruptly by the Paskapoo Formation. It is equivalent to the Scollard Formation of the west-central Alberta plains, the Willow Creek Formation in the southwestern plains, and part or all of the Ravenscrag Formation in Saskatchewan. [3] [6] The base of the Coalspur coal zone is equivalent to the base of the Ardley coal zone, which is also floored on the K-Pg boundary bed. [4] [7]

Paleontology

Plant fossils [8] and mammal remains [9] have been described from the Coalspur Formation, but although the lower part of the formation is of Late Cretaceous age, no dinosaur remains have yet been reported.

Fossils reported from the Coalspur Formation: [10]

Resources

The Coalspur Formation includes seven major seams that range up to 22 metres (72 ft) in thickness. The coal is of sub-bituminous B to C rank, with a low sulphur content. It is mined in the Alberta Coal Branch area and shipped to electric power generating stations in Canada and abroad. [11]

See also

Related Research Articles

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The Scollard Formation is an Upper Cretaceous to lower Palaeocene stratigraphic unit of the Western Canada Sedimentary Basin in southwestern Alberta. Its deposition spanned the time interval from latest Cretaceous to early Paleocene, and it includes sediments that were deposited before, during, and after the Cretaceous-Paleogene (K-Pg) extinction event. It is significant for its fossil record, and it includes the economically important coal deposits of the Ardley coal zone.

The Willow Creek Formation is a stratigraphic unit of Late Cretaceous to Early Paleocene age in the Western Canada Sedimentary Basin of southwestern Alberta. It was first described by George Mercer Dawson in 1883 along the Willow Creek, a tributary of the Oldman River. Williams and Dyer defined the type section in 1930 at the mouth of Willow Creek, east of Fort Macleod.

<span class="mw-page-title-main">Cadomin Formation</span> Geological formation in Canada

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Gething Formation is a stratigraphic unit of Lower Cretaceous (Aptian) age in the Western Canada Sedimentary Basin. It is present in northeastern British Columbia and western Alberta, and includes economically important coal deposits.

Bullhead Group is a stratigraphic unit of Lower Cretaceous age in the Western Canada Sedimentary Basin of northeastern British Columbia and western Alberta. It was first defined by F.H. McLearn in 1918 as the Bullhead Mountain Formation, but later was upgraded to group status. It consists of the Cadomin and Gething Formations, although some early workers included the Bluesky Formation and others in the group.

<span class="mw-page-title-main">Paskapoo Formation</span> Stratigraphic unit in Western Canada

The Paskapoo Formation is a stratigraphic unit of Middle to Late Paleocene age in the Western Canada Sedimentary Basin. The Paskapoo underlies much of southwestern Alberta, and takes the name from the Blindman River. It was first described from outcrops along that river, near its confluence with the Red Deer River north of the city of Red Deer, by Joseph Tyrrell in 1887. It is important for its freshwater aquifers, its coal resources, and its fossil record, as well as having been the source of sandstone for the construction of fire-resistant buildings in Calgary during the early 1900s.

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<span class="mw-page-title-main">Edmonton Group</span> Stratigraphic unit in central Alberta, Canada

Within the earth science of geology, the Edmonton Group is a Late Cretaceous to early Paleocene stratigraphic unit of the Western Canada Sedimentary Basin in the central Alberta plains. It was first described as the Edmonton Formation by Joseph Burr Tyrrell in 1887 based on outcrops along the North Saskatchewan River in and near the city of Edmonton. E.J.W. Irish later elevated the formation to group status and it was subdivided into four separate formations. In ascending order, they are the Horseshoe Canyon, Whitemud, Battle and Scollard Formations. The Cretaceous-Paleogene boundary occurs within the Scollard Formation, based on dinosaurian and microfloral evidence, as well as the presence of the terminal Cretaceous iridium anomaly.

The Ravenscrag Formation is a stratigraphic unit of early Paleocene age in the Western Canada Sedimentary Basin. It was named for the settlement of Ravenscrag, Saskatchewan, and was first described from outcrops at Ravenscrag Butte near the Frenchman River by N.B. Davis in 1918.

<span class="mw-page-title-main">Morrissey Formation</span>

The Morrissey Formation is a stratigraphic unit of Late Jurassic (Portlandian) age in the Western Canada Sedimentary Basin. It is named for outcrops on Morrissey Ridge, 16 kilometres (10 mi) southeast of Fernie, British Columbia, and is present in southeastern British Columbia and southwestern Alberta.

The Elk Formation is a stratigraphic unit of the Western Canada Sedimentary Basin that is present in southeastern British Columbia and southwestern Alberta. It is probably of Early Cretaceous age, but in some areas its strata could be as old as Late Jurassic. It includes minor thin coal beds and was named for outcrops near the now-abandoned Elk River coal mine east of Fernie, British Columbia.

The Minnes Group, originally named the Minnes Formation, is a geologic unit of latest Jurassic to earliest Cretaceous age in the Western Canada Sedimentary Basin. It is present in the northern foothills of the Canadian Rockies and the adjacent plains in northeastern British Columbia and west-central Alberta. Its strata include natural gas reservoirs and minor coal deposits. Fossil dinosaur tracks have been described from one of its formations.

The Flume Formation is a geologic formation in the Western Canada Sedimentary Basin in Alberta, Canada. It was deposited as an extensive carbonate platform along the western edge of the basin during Late Devonian (Frasnian) time and the reefs of the Cairn Formation subsequently developed on it.

The Monach Formation is a geologic formation of Early Cretaceous (Valanginian) age in the Western Canada Sedimentary Basin that consists primarily of sandstone. It is present in the northern foothills of the Canadian Rockies and the adjacent plains in northeastern British Columbia.

The Monteith Formation is a geologic formation of Early Cretaceous (Valanginian) age in the Western Canada Sedimentary Basin that consists primarily of sandstone. It is present in the northern foothills of the Canadian Rockies and the adjacent plains in northeastern British Columbia and west-central Alberta.

The Kootenay Group, originally called the Kootenay Formation, is a geologic unit of latest Jurassic to earliest Cretaceous age in the Western Canada Sedimentary Basin that is present in the southern and central Canadian Rockies and foothills. It includes economically important deposits of high-rank bituminous and semi-anthracite coal, as well as plant fossils and dinosaur trackways.

The Bickford Formation is a geologic formation of Early Cretaceous (Valanginian) age in the Western Canada Sedimentary Basin that consists primarily of nonmarine sediments. It is present in the northern foothills of the Canadian Rockies in northeastern British Columbia.

The Luscar Group is a geologic unit of Early Cretaceous age in the Western Canada Sedimentary Basin that is present in the foothills of southwestern Alberta. It is subdivided into a series of formations, some of which contain economically significant coal deposits that have been mined near Cadomin and Luscar. Coal mining in those areas began in the early 1900s and continues near Luscar as of 2016.

The Gladstone Formation is a stratigraphic unit of Early Cretaceous (Aptian) age in the Western Canada Sedimentary Basin. It is present in the foothills of southwestern Alberta and is named for outcrops along Gladstone Creek, a tributary of the Castle River south of the Crowsnest Pass.

The Ma Butte Formation is a stratigraphic unit of Early Cretaceous (Albian) age in the Western Canada Sedimentary Basin. It was named for Ma Butte, a mountain north of Coleman, Alberta, by J.R. McLean in 1980. It is present in the foothills of southwestern Alberta and it contains plant fossils.

References

  1. ↑ Mackay, B.R. 1949. Coal areas of Alberta. Geological Survey of Canada, Atlas to accompany estimate of coal reserves for the Royal Commission on Coal.
  2. 1 2 Mossop, G.D. and Shetsen, I. (compilers), Canadian Society of Petroleum Geologists (1994). "The Geological Atlas of the Western Canada Sedimentary Basin, Chapter 24: Upper Cretaceous and Tertiary strata of the Western Canada Sedimentary Basin". Archived from the original on 2016-07-01. Retrieved 2016-06-20.{{cite web}}: CS1 maint: multiple names: authors list (link)
  3. 1 2 3 4 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.
  4. 1 2 Jerzykiewicz, T. and Sweet, A.R. 1986. The Cretaceous-Tertiary boundary, central Alberta foothills. In: Stratigraphy. Canadian Journal of Earth Sciences, vol. 23, p. 1356-1374.
  5. ↑ Prior, G. J.; Hathaway, B.; Glombick, P.M.; Pana, D.I.; Banks, C.J.; Hay, D.C.; Schneider, C.L.; Grobe, M.; Elgr, R. & Weiss, J.A. (2013). "Bedrock Geology of Alberta. Alberta Geological Survey, Map 600". Archived from the original on 2016-06-26. Retrieved 2016-06-20.
  6. ↑ Alberta Geological Survey, 2013. "Alberta Table of Formations; Alberta Energy Regulator" (PDF). Archived from the original (PDF) on 2015-09-25. Retrieved 2016-06-20.{{cite web}}: CS1 maint: numeric names: authors list (link)
  7. ↑ Langenberg, C.W., Berhane, H., Sweet, A.R., Marchioni, D. and Heamann, L.M. 2007. Regional correlations of the Ardley coal zone, Alberta. Alberta Geological Survey, Earth Sciences Report 2007-5, 21 p.
  8. ↑ Bell, W.A. 1949. Uppermost Cretaceous and Paleocene floras of western Canada. Geological Survey of Canada, Bulletin 13, 231 p.
  9. ↑ Fox, R.C., 1990. The succession of Paleocene mammals in western Canada. Geological Society of America, Special Paper 243, pp. 51-70.
  10. ↑ Diss Locality at Fossilworks.org
  11. ↑ Mossop, G.D. and Shetsen, I. (compilers), Canadian Society of Petroleum Geologists (1994). "The Geological Atlas of the Western Canada Sedimentary Basin, Chapter 33: Coal Resources of the Western Canada Sedimentary Basin". Archived from the original on 2016-07-01. Retrieved 2016-06-20.{{cite web}}: CS1 maint: multiple names: authors list (link)
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