| Sheep Track Member | |
|---|---|
| Stratigraphic range: Holocene | |
| Type | Geological member[1] |
| Unit of | Big Raven Formation[2] |
| Overlies | Snowshoe Lava Field, Ice Peak Formation, Kakiddi Formation[3] |
| Area | About 40 square kilometres (15 square miles)[4] |
| Thickness | Up to 2 metres (6.6 feet)[4] |
| Lithology | |
| Primary | Comenditic trachyte[2] |
| Location | |
| Coordinates | 57°38′N 130°40′W / 57.64°N 130.67°W[5] |
| Region | British Columbia |
| Country | Canada |
| Type section | |
| Named by | Souther, 1988[1] |
 Location in Mount Edziza Provincial Park | |
The Sheep Track Member is a stratigraphic unit of the Big Raven Formation, part of the Mount Edziza volcanic complex in northwestern British Columbia, Canada. It consists of pumice from an explosive eruption that fell over an area about 40 square kilometres (15 square miles). The pumice is of comenditic trachyte composition and reaches a thickness of up to 2 metres (6.6 feet) along the western edge of Tencho Glacier.
The Sheep Track Member was originally defined as the Sheep Track Formation in 1984 and was one of many geological formations comprising the Mount Edziza volcanic complex. However, it was lowered to member rank in 1988 when it became a unit of the Big Raven Formation. The Sheep Track Member has also been called the Sheep Track Pumice due to the member consisting primarily of pumice.
- ^ a b "Sheep Track Member". Lexicon of Canadian Geologic Units. Government of Canada. Archived from the original on 2023-12-15. Retrieved 2024-03-10.
- ^ a b Souther 1992, p. 213.
- ^ Souther, J. G. (1988). "1623A" (Geologic map). Geology, Mount Edziza Volcanic Complex, British Columbia. 1:50,000. Cartography by M. Sigouin, Geological Survey of Canada. Energy, Mines and Resources Canada. doi:10.4095/133498.
- ^ a b Souther 1992, p. 236.
- ^ "Sheep Track Pumice". Catalogue of Canadian volcanoes. Natural Resources Canada. Archived from the original on 2010-12-11. Retrieved 2024-03-10.