Ishbel Group
The Ishbel Group is a stratigraphic unit of Permian age in the Western Canadian Sedimentary Basin. It is present in the Canadian Rockies of Alberta and British Columbia. First defined by A. McGugan in 1963, it is named for Mount Ishbel of the Sawback Range in Banff National Park, and parts of the group were first described in the vicinity of the mountain at Ranger Canyon and Johnston Canyon.
| Ishbel Group | |
|---|---|
| Stratigraphic range: | |
Calcareous siltstone exposed along the Johnston Creek west of Banff | |
| Type | Group |
| Underlies | Spray River Group |
| Overlies | Tunnel Mountain Formation, Kananaskis Formation |
| Thickness | Up to about 425 m (1,394 ft) |
| Lithology | |
| Primary | Limestone, dolomite, sandstone |
| Other | Chert, siltstone |
| Location | |
| Region | Alberta British Columbia |
| Country | Canada |
| Extent | Western Canadian Sedimentary Basin |
| Type section | |
| Named for | Mount Ishbel |
| Named by | A. McGugan |
| Year defined | 1963 |
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