Doig Formation
From Wikipedia, the free encyclopedia
| 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′N 121°18′W / 55.7°N 121.3°W |
| Approximate paleocoordinates | 25°06′N 35°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 |
  Doig Formation (Canada)  Doig Formation (British Columbia) | |
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]
Distribution
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]