fld009-01 29 pages 1 Russell, J.K., Hickson, C.J., and Andrews, G., 2007, Canadian Cascade volcanism: Subglacial to explosive eruptions along the Sea to Sky Corridor, British Columbia, in Stelling, P., and Tucker, D.S., eds., Floods, Faults, and Fire: Geological Field Trips in Washington State and Southwest British Columbia: Geological Society of America Field Guide 9, p. 1–29, doi: 10.1130/2007.fld009(01). For permission to copy, contact editing@geosociety.org. ©2007 The Geological Society of America. All rights reserved. INTRODUCTION This field guide was prepared in support of a two-day field trip to examine Quaternary volcanism in the Canadian Cascade arc informally named the Garibaldi volcanic belt. The field trip has two somewhat diverse goals. The first day of the trip pro- ceeds along the Whistler corridor from Squamish to Pemberton and focuses on Quaternary glaciovolcanic deposits. Interactions between volcanoes and ice in the Garibaldi volcanic belt have been common during the past two million years. This style of vol- canism has created a diverse array of landforms, including sub- glacial domes, tuyas, impounded lava masses, and esker-shaped The Geological Society of America Field Guide 9 2007 Canadian Cascade volcanism: Subglacial to explosive eruptions along the Sea to Sky Corridor, British Columbia J.K. Russell Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia, Canada C.J. Hickson Geological Survey of Canada, Vancouver, British Columbia, Canada Graham Andrews Earth and Ocean Sciences, The University of British Columbia, Vancouver, British Columbia, Canada ABSTRACT Here we describe a two-day field trip to examine Quaternary volcanism in the Canadian Cascade arc, named the Garibaldi volcanic belt. Day 1 of the trip proceeds along the Whistler corridor from Squamish to Pemberton and focuses on Quaternary glaciovolcanic deposits. Interactions between volcanoes and ice in the Garibaldi vol- canic belt have been common during the past two million years and this has resulted in a diverse array of landforms, including subglacial domes, tuyas, impounded lava masses, and sinuous lavas that exploited within-ice drainage systems. On Day 2, the trip heads northwest of Pemberton, British Columbia, along logging roads to see deposits from the 2360 yr B.P. eruption of the Mount Meager volcanic complex. This eruption began Plinian-style, generating pyroclastic fall and flow deposits and ended with the production of block and ash pyroclastic flows by explosive (Vulcanian) col- lapse of lava domes (e.g., Soufriére Hills). Many of the traits of the deposits seen on this two day trip are a reflection of, both, the style of eruption and the nature of the surrounding landscape. In this regard, the trip provides a spectacular window into the nature and hazards of effusive and explosive volcanism occurring in mountainous terrains and the role of water and ice. Keywords: Cascades, Garibaldi volcanic belt, glaciovolcanism, Mount Meager, explosive, topography.