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Yahatinda Formation
The Yahatinda Formation is a geologic formation of Middle Devonian (Givetian) age on the western edge of the Western Canada Sedimentary Basin in Alberta. Its type locality lies the on the eastern face of Wapiti Mountain above Ya-Ha-Tinda Ranch at the eastern edge of Banff National Park. The Yahatinda contains a variety of Devonian fossils.〔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 Yahatinda Formation includes both terrestrial channel and littoral marine sediments. The channel deposits, which are well exposed at the type locality, consist of reddish, medium- to coarse-grained, cross-bedded dolomitic sandstones, siltstones, conglomerates and breccias. The channels contain eroded cobbles and boulders from the older underlying formations, as well as the remains of land plants and freshwater fish.
The littoral deposits consist of micritic mudstones and dolomitic mudstones that are thought to have been deposited in intertidal to supratidal environments. These sequences include paleosols, calcrete and dolocrete.〔Williams, C.A. and Krause, F.F. 2000. Paleosol chronosequences and peritidal deposits of the Middle Devonian (Givetian) Yahatinda Formation, Wasootch Creek, Alberta, Canada. Bulletin of Canadian Petroleum Geology, vol. 48, no. 1, p. 1-18.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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