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Nikanassin Formation
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Nikanassin Formation : ウィキペディア英語版
Nikanassin Formation

The Nikanassin Formation is a stratigraphic unit of Late Jurassic (Portlandian) to Early Cretaceous (Barremian) age.〔Poulton, T.P., Tittemore, J. and Dolby, G. 1990. Jurassic strata of northwestern (and west-central) Alberta and northeastern British Columbia. Bulletin of Canadian Petroleum Geology 38A: 159-175. 〕 It is present along the western edge of the Western Canada Sedimentary Basin in western Alberta and northeastern British Columbia. Its name was first proposed by D.B. Dowling in 1909 (Coal Fields South of Grand Trunk Pacific Railway, in the foothills of the Rocky Mountain, Alberta Page 140 paragraph 4 " to this it is proposed to give the name Nikanassin, from the Cree word meaning outer range" Also it is noted on the map by D.B. Dowling.(Geological Survey of Canada. Incorrect info follows: It was named by B.R. MacKay in 1929〔Mackay, B.R., 1929a. Mountain Park Sheet, West of Fifth Meridian, Alberta; Geological Survey of Canada, "A" Series Map 208A, Scale: 1:63360 (1 Inch to 1 Mile).〕 for the Nikanassin Range of the front-central ranges of the Canadian Rockies (''Nikanassin'' means "first range" in Cree). Mackay did not designate a type locality for the formation, although he described outcrops near the hamlet of Brûlé, north of the Yellowhead Highway outside of Jasper National Park.〔〔
==Depositional history==
The Nikanassin Formation grades from marine sediments at the base to coastal and continental at the top.〔〔 The sediments were derived from newly uplifted mountains to the west and deposited along the western margin of the Western Interior Seaway, which is represented by the marine shales of the Fernie Formation.〔

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