The Thumb (Omineca)
| The Thumb | |
|---|---|
| Highest point | |
| Elevation | 1,854 m (6,083 ft) |
| Prominence | 189 m (620 ft) |
| Coordinates | 56°09′47.2″N 126°44′48.8″W / 56.163111°N 126.746889°W |
| Geography | |
| Location | British Columbia, Canada |
| District | Cassiar Land District |
| Parent range | Connelly Range Hogem Ranges Omineca Mountains |
| Topo map | NTS 94D2 Salix Creek |
| Geology | |
| Mountain type | Volcanic plug |
| Last eruption | Unknown; Quaternary age[1] |
The Thumb is a
Geology
The Thumb is the largest in a cluster of roughly seven volcanic plugs. They are surrounded by the remains of eroded cinder cones, lava flows and dikes. Even though the plugs have not been dated, the existence of loose scoria and related intravalley lava flows to the current topography indicates they formed in the last 2.5 million years of the Quaternary period.[1]
The vertical structure of The Thumb develops a prominent monument rising approximately 189 m (620 ft) above smoothly rising landscape along the ridge of the
The Thumb consists of alkali olivine basalt along with other Quaternary volcanic plugs in the
See also
- List of volcanoes in Canada
- List of Northern Cordilleran volcanoes
- Volcanism of Canada
- Volcanism of Western Canada
- Thumb Peak
References
- ^ ISBN 0-521-43811-X.
External links
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