Doig Formation | |
---|---|
Stratigraphic range: middle Anisian-Ladinian ~ | |
Type | Geological formation |
Underlies | Halfway Formation |
Overlies | Montney Formation |
Thickness | up to 190 metres (620 ft) [1] |
Lithology | |
Primary | Siltstone, shale |
Other | Phosphate, sandstone |
Location | |
Coordinates | 55°42′N121°18′W / 55.7°N 121.3°W |
Approximate paleocoordinates | 25°06′N35°00′E / 25.1°N 35.0°E |
Region | NW Alberta NE British Columbia SE Yukon |
Country | Canada |
Extent | Western Canadian Sedimentary Basin |
Type section | |
Named for | Doig River |
Named by | J.H. Armitage |
Year defined | 1962 |
The Doig Formation is a geologic formation of middle Triassic age in the Western Canadian Sedimentary Basin. It takes the name from Doig River, a tributary of the Beatton River, and was first described in the Texaco N.F.A. Buick Creek No. 7 well (located north-west of Fort St. John, east of the Alaska Highway) by J.H. Armitage in 1962. . [2]
The Doig Formation is composed of fine grained, grey argillaceous siltstone and dark calcareous shale. [1] Phosphate nodules occur at the base of the formation. Anomalously thicker, porous sandstone channels and bars are present locally in the upper units of the formation. [3] The formation has provided fossils of various species of conodonts; Magnigondolella alexanderi , M. cyri , M. julii , M. nebuchadnezzari , M. salomae , Neogondolella curva , N. hastata , N. panlaurentia and N. ex gr. shoshonensis . [4]
The Doig Formation reaches a maximum thickness of 190 metres (620 ft) in the Canadian Rockies foothills it thins towards the north and east. It occurs in the subsurface in north-western Alberta, north-eastern British Columbia and southern Yukon, from 53°N and 118°W to the Canadian Rockies. [1]
The Doig Formation is unconformably overlain by the Halfway Formation of the Schooler Creek Group; the contact is marked by a dolomitic bed and a chert and quartz conglomerate bed. [5] To the west it is overlain by younger Jurassic beds. It conformably overlies the Montney Formation and the contact is marked by a phosphate pellet bed in the base of the Doig. [1]
The formation correlates with the lower Llama Member of the Sulphur Mountain Formation in the southern ranges of the Canadian Rockies, with the Whistler Member of the Whitehorse Formation in the Muskwa Ranges, and with the Toad Formation in the upper Liard River area. [1]
The Doig formation is an important source rock for the Triassic Halfway and Charlie Lake formations. [6] Total organic carbon values in the "phosphate zone" at the base of the Doig are commonly greater than 4% by weight and can reach up to 11%. The "phosphate zone" is also a potential undeveloped shale gas reservoir with as much as 400 trillion cubic feet of natural gas in place. [7] Oil and gas is also extracted from the Doig Formation in conventional reservoirs along the western Montney trend and in the Peace River Arch.
The Montney Formation is a stratigraphical unit of Lower Triassic age in the Western Canadian Sedimentary Basin in British Columbia and Alberta.
The Cardium Formation is a stratigraphic unit of Late Cretaceous age in the Western Canada Sedimentary Basin. It takes the name from the fossilized heart-shaped cockle shells in the family Cardiidae present. It was first described along the Bow River banks by James Hector in 1895. It is present throughout western Alberta and in northeastern British Columbia, and it is a major source of petroleum and natural gas.
The Debolt Formation is a stratigraphical unit of Meramecian age in the Western Canadian Sedimentary Basin.
The Fernie Formation is a stratigraphic unit of Jurassic age. It is present in the western part of the Western Canada Sedimentary Basin in western Alberta and northeastern British Columbia. It takes its name from the town of Fernie, British Columbia, and was first defined by W.W. Leach in 1914.
The Spirit River Formation is a stratigraphical unit of middle Albian age in the Western Canadian Sedimentary Basin.
The Belloy Formation is a stratigraphical unit of Permian age in the Western Canadian Sedimentary Basin.
The Dunvegan Formation is a stratigraphical unit of Cenomanian age in the Western Canadian Sedimentary Basin.
The Schooler Creek Group is a stratigraphic unit of Middle to Late Triassic age in the Western Canadian Sedimentary Basin. It is present in northeastern British Columbia. It was named for Schooler Creek, a left tributary of Williston Lake, and was first described in two oil wells northwest of Fort St. John, by F.H. McLearn in 1921. Exposures along Williston Lake serve as a type locality in outcrop.
The Baldonnel Formation is a stratigraphical unit of Carnian age in the Western Canadian Sedimentary Basin.
The Exshaw Formation is a stratigraphic unit in the Western Canada Sedimentary Basin. It takes the name from the hamlet of Exshaw, Alberta in the Canadian Rockies, and was first described from outcrops on the banks of Jura Creek north of Exshaw by P.S. Warren in 1937. The formation is of Late Devonian to Early Mississippian age as determined by conodont biostratigraphy, and it straddles the Devonian-Carboniferous boundary.
The Viking Formation is a stratigraphical unit of Cretaceous age in the Western Canadian Sedimentary Basin.
The Horn River Formation is a stratigraphic unit of Devonian age in the Western Canadian Sedimentary Basin.
The Beaverhill Lake Group is a geologic unit of Middle Devonian to Late Devonian age in the Western Canada Sedimentary Basin that is present in the southwestern Northwest Territories, northeastern British Columbia and Alberta. It was named by the geological staff of Imperial Oil in 1950 for Beaverhill Lake, Alberta, based on the core from a well that they had drilled southeast of the lake, near Ryley, Alberta.
The Duvernay Formation is a stratigraphical unit of Frasnian age in the Western Canadian Sedimentary Basin.
The Phosphoria Formation of the western United States is a geological formation of Early Permian age. It represents some 15 million years of sedimentation, reaches a thickness of 420 metres (1,380 ft) and covers an area of 350,000 square kilometres (140,000 sq mi).
The Liard Formation is a stratigraphic unit of Middle Triassic to Late Triassic age in the Western Canadian Sedimentary Basin that is present in northeastern British Columbia. It takes its name from the Liard River, and was first described from outcrops on the southern bank of that river, near Hell Gate Rapids in the Grand Canyon of the Liard, by E.D. Kindle in 1946.
The Alexo Formation a stratigraphic unit of Late Devonian age. It is present on the western edge of the Western Canada Sedimentary Basin in the central Rocky Mountains and foothills of Alberta. The formation consists primarily of dolomite. It is locally fossiliferous and includes remains of marine animals such as brachiopods and conodonts.
The Survey Peak Formation is a stratigraphic unit of latest Cambrian to earliest Ordovician age. It is present on the western edge of the Western Canada Sedimentary Basin in the Canadian Rockies of Alberta and British Columbia. It was named for Survey Peak near Mount Erasmus in Banff National Park by J.D. Aitken and B.S. Norford in 1967. The Survey Peak Formation is fossiliferous and includes remains of trilobites and other marine invertebrates, as well as conodonts, stromatolites, and thrombolites.
The Sulphur Mountain Formation is a geologic formation of Early to Middle Triassic age. It is present on the western edge of the Western Canada Sedimentary Basin in the foothills and Rocky Mountains of western Alberta and northeastern British Columbia. It includes marine fossils from the time shortly after the Permian-Triassic extinction event.
Toad Formation, Grayling Formation, and Toad-Grayling Formation are obsolete names for the strata of the Early to Middle Triassic Doig and Montney Formations. They were applied in the foothills and Rocky Mountains of northeastern British Columbia, on the western edge of the Western Canada Sedimentary Basin. Although the names are considered obsolete, their usage persists.
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