Vulcan's Thumb

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Vulcan's Thumb
Vulcan's Thumb.jpg
Elevation 2,290 m (7,510 ft)
Location
Location British Columbia, Canada
Range Pacific Ranges
Coordinates 50°07′N 123°17′W / 50.11°N 123.29°W / 50.11; -123.29
Topo map NTS 92J/03
Geology
Type Stratovolcano
Age of rock Pleistocene
Volcanic arc/belt Canadian Cascade Arc
Garibaldi Volcanic Belt
Last eruption Pleistocene
Climbing
First ascent None

Vulcan's Thumb is a deeply dissected, unstable stratovolcano[1] located directly on the southern ridge of Pyroclastic Peak. It is one of the five main volcanic peaks of the Mount Cayley massif and remains unclimbed because of technical difficulties and its loose rock. Vulcan's Thumb is believed to have last erupted during the Pleistocene period.[1]

The creation of Vulcan's Thumb consist of vent breccia, massive lava flows, and agglutinated breccia of plagioclase, hypersthene, hornblende, biotite, phyric dacite deposited as part of an edifice that raised upon the southwestern edge of the ancestral Mount Cayley.

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