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The AAPG/Datapages Combined Publications Database

CSPG Bulletin


Alberta Society of Petroleum Geologists News Bulletin
Vol. 1 (1953), No. 6. (June), Pages 3-3

Reef Development in the Devonian of the Canadian Rockies

D. J. McLaren


The Fairholme formation of the Bow Valley region in the eastern Rockies is the largest reef complex known in the mountains and is composed for the most part of coarse grained dolomites. It is made up of several distinct "building units", which include: (1) massive dark coloured dolomites formed almost entirely of stromatoporoids, - the "black reefs"; (2) dark coloured, bedded dolomites largely composed of rod algae (Amphipora), stromatoporoids, and corals, - the "Amphipora and stromatoporoid beds"; (3) grey and brown, bedded to massive dolomites largely composed of colonial rugose corals, - the "coral beds"; (4) dark colored, bedded dolomites, without obvious organic constituents, presumably detrital; (5) pale grey, massive dolomites without obvious structure, - the "white reefs".

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