High Quality Content by WIKIPEDIA articles! Vulcan's Thumb is a
rotten stratovolcano located directly on the southern ridge of
Pyroclastic Peak. It is one of the five main volcanic peaks of
Mount Cayley and remains unclimbed because of technical
difficulties and its loose rock. Vulcan's Thumb is believed to have
last erupted during the Pleistocene period.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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