Meager

Mount Meager volcanic complex, of Pliocene-to-Holocene age, forms a dissected andesitic-to-rhyodacitic stratovolcano with multiple eroded summit lava domes and volcanic necks. It lies in the Garibaldi volcanic belt and is the northernmost volcano of the Cascade arc that extends to northern California. The summit of the complex consists of overlapping piles of andesitic lava flows and younger dacitic lava domes and flows.

Quaternary basalts underlying the uppermost 22 km of the Elaho valley originated at the 1375 m level in the South Fork Meager River. The most recent activity, about 2350 years ago, produced Canada's largest known Holocene explosive eruption and an associated welded block-and-ash flow and a lava flow from a vent on the NE flank of Plinth Peak. Two clusters of hot springs occur within the complex, which has been investigated for potential geothermal power.