Mount Cayley volcanic field

The Mount Cayley volcanic field is a remote volcanic zone on British Columbia’s South Coast and part of the Garibaldi Volcanic Belt, the Canadian segment of the Cascade Volcanic Arc. Formed by subduction at the Cascadia margin between about 1.6 and 5.3 million years ago, it has produced at least 23 eruptions ranging from lava flows to explosive events. Many volcanoes formed beneath glacial ice during the last glacial period, creating steep-sided, flat-topped tuyas and subglacial lava domes later exposed by deglaciation. Mount Cayley, the field’s largest and longest-lived centre, is a heavily eroded stratovolcano, and the area remains significant as a clear record of glaciated volcanism, with some centres active within the last 10,000 years.

British Columbia · Canada