Windermere group
Called the Windermere Group in the United States and the Windermere Supergroup, Windermere Series, and Windermere System in Canada, the Windermere sequence of North America is an extensive assemblage of sedimentary and volcanic rocks of latest Precambrian (Neoproterozoic) age. It is present in the northern part of the North American Cordillera, stretching from Montana, Idaho, and Washington in the northwestern United States, through Alberta, British Columbia, the Northwest Territories, and the Yukon in western Canada. It was named for the Windermere map-area in the East Kootenay region of southeastern British Columbia by J.F. Walker in 1926.
| Windermere Group | |
|---|---|
| Stratigraphic range: | |
| Type | Geological group or supergroup |
| Sub-units | Many |
| Underlies | Various units |
| Overlies | Purcell Supergroup (Belt Supergroup) |
| Thickness | more than 8,000 metres (26,250 ft) |
| Lithology | |
| Primary | Conglomerate, sandstone |
| Other | Shale, carbonate rocks |
| Location | |
| Region | Montana, Idaho, Washington; Alberta, British Columbia, Northwest Territories, Yukon |
| Country | United States Canada |
| Type section | |
| Named for | Windermere map-area, British Columbia |
| Named by | J.F. Walker |
The Windermere rocks include Ediacaran fossils and stromatolites, and host deposits of base and precious metals.