Caribou Tuya

Caribou Tuya is a volcanic mountain in far northwestern British Columbia, Canada, formed as a basaltic subglacial mound when magma erupted beneath glacial ice. Its activity began during the Fraser glaciation, about 25,000 to 10,000 years ago, and it likely formed and last erupted in the Pleistocene Epoch. The mountain preserves the typical sequence of an under-ice eruption, with pillow lavas at the base, overlain by hyaloclastite deposits, and in places capped by basaltic lava flows that emerged into the open air. Its rocks help show how lava interacted with ice and meltwater as the volcano was built.

British Columbia · Canada