Mount Garibaldi is associated with a group of small volcanoes that form the Garibaldi Lake volcanic field. An unusual volcanic structure called The Table is located between Garibaldi Lake and Mount Garibaldi. This several-hundred-foot-high flat-topped volcano is made of layers of andesitic dacite that are arranged like a stack of more or less equal sized pancakes. The Table was formed in the early Holocene at a time when the Cordilleran ice sheet covered the region. As the volcano's lava rose it melted the part of the ice sheet above The Table's vent, creating space for the lava to move into. Repeated eruptions constructed the steep-walled stack of lava seen today.