eastern side of Howe Sound lies the southernmost zone of volcanic activity in the Garibaldi chain. This zone, known as the Watts Point volcanic centre, is a small outcrop of volcanic rock that is a portion of a subglacial volcano. The outcrop covers an area of about and an eruptive volume of roughly . The location is heavily forested and the BC Rail mainline passes through the lower portion of the outcrop about above sea level. It represents a feature in the Squamish volcanic field. Mount Garibaldi, one of the larger volcanoes in the southern Garibaldi Belt with a volume of , is composed of dacite lavas that were erupted in the past 300,000 years. It was constructed when volcanic material erupted onto a portion of the Cordilleran Ice Sheet during the Pleistocene period. This created the unique asymmetrical shape of the mountain. Successive landslides on Garibaldi's flanks occurred after glacial ice of the Cordilleran Ice Sheet retreated. Subsequent volcanism about 9,300 years ago produced a long dacite lava flow from Opal Cone on Garibaldi's southeastern flank. This is unusually long for a dacite flow, which commonly travel only short distances from a volcanic vent due to their high viscosity. The Opal Cone lava flow represents the most recent volcanic feature at Mount Garibaldi. On the western shore of Garibaldi Lake, Mount Price represents a stratovolcano with an elevation of . It was constructed during three periods of activity. The first phase 1.2 million years ago formed a hornblende andesite stratovolcano on the drift-covered floor of a circular basin. After this stratovolcano was constructed, volcanism moved to the west where a series of andesite-dacite lava flows and pyroclastic flows were extruded during a period of Peléan activity 300,000 years ago. This created the high cone of Mount Price, which was later buried under glacial ice. Before Mount Price was overridden by glacial ice, volcanic activity took place on its northern flank where a satellite vent is present. Renewed activity took place at Clinker Peak on the western flank of Mount Price 9,000 years ago. This produced the Rubble Creek and Clinker Ridge andesite lava flows that extend to the northwest and southwest. After these flows traveled , they were dammed against glacial ice to form an ice-marginal lava flow more than thick known as The Barrier. Cinder Cone on the north shore of Garibaldi Lake is a cinder cone partly