Most of the Silverthrone Caldera's eruptions in the Pacific Range occurred during the last ice age and was episodically active during both Pemberton and Garibaldi Volcanic Belt stages of volcanism. The caldera is one of the largest of the few calderas in western Canada, measuring about long (north-south) and wide (east-west). The last eruption from Mount Silverthrone ran up against ice in Chernaud Creek. The lava was dammed by the ice and made a cliff with a waterfall up against it. The most recent activity was 1000 years ago.