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Flume Formation
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.〔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.〕
==Lithology==
The Flume Formation was deposited as limestone, but it was strongly dolomitized during diagenesis, and it now consists primarily of dark grey, medium-to thick-bedded, fine to medium crystalline dolostone. It includes abundant dark grey chert nodules and stringers, as well as scattered stromatoporoids and ''Amphipora''. It is distinguished from the overlying Cairn Formation by its higher chert content and lower fossil content. In areas where it is overlain by Cairn Formation reefs the Flume may be classified as the lower member of the Cairn Formation, but where the Cairn is absent the Flume has formation rank.〔
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