Yahatinda Formation
| Yahatinda Formation Stratigraphic range: Givetian |
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|---|---|
Fossil plant (a trimerophyte) from the Yahatinda Formation
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| Type | Formation |
| Underlies | Flume Formation |
| Overlies | Cambrian to Ordovician formations |
| Thickness | Typically less than 30 m (98 ft) |
| Lithology | |
| Primary | Dolomitic sandstone, siltstone and mudstone |
| Other | Conglomerate and breccia |
| Location | |
| Coordinates | 51°44′00″N 115°43′30″W / 51.73333°N 115.72500°WCoordinates: 51°44′00″N 115°43′30″W / 51.73333°N 115.72500°W |
| Region |
 Alberta
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| Country |
 Canada
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| Type section | |
| Named for | Ya-Ha-Tinda Ranch, Alberta |
| Named by | J.D. Aitken, 1966 |
The Yahatinda Formation is a geologic formation of Middle Devonian (Givetian) age in the southwestern part of the Western Canada Sedimentary Basin in the mountains of southwestern 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.
The Yahatinda Formation includes both terrestrial river 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.
The Yahatinda Formation is present as discontinuous outcrops in the front ranges of the Canadian Rockies in Alberta, from the Brazeau River in the north to near the Kananaskis Lakes in the south, and possibly at Mount Wilson in extreme southern Alberta.
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