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Morrissey Formation : ウィキペディア英語版 | Morrissey Formation
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, southeast of Fernie, British Columbia, and is present in southeastern British Columbia and southwestern Alberta.〔 == Stratigraphy and lithology ==
The Morrissey Formation is the basal unit of the Kootenay Group. It consists of massive, cliff-forming, fine- to coarse-grained sandstone, with minor beds and lenses of conglomeratic sandstone, and rare beds of siltstone, carbonaceous mudstone, and coal. The sequence coarsens upward and, in most areas, it can be subdivided into two members. The lower portion, called the Weary Ridge Member, consists of orange-brown weathering, slightly argillaceous, calcareous sandstone with rare siltstone and mudstone interbeds. The upper portion, called the Moose Mountain Member, consists of hard, medium grey to brownish grey weathering, siliceous sandstone with rare beds of carbonaceous mudstone and coal. The contact between the two members is abrupt but conformable.〔〔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.〕
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