The Chilcotin Group is a north-south range of volcanoes in southern British Columbia running parallel to the Garibaldi Volcanic Belt. The majority of the eruptions in this belt happened either 6-10 million years ago (Miocene) or 2-3 million years ago (Pliocene), although with some slightly more recent eruptions (in the Pleistocene). It is thought to have formed as a result of back-arc extension behind the Cascadia subduction zone. Volcanoes in this belt include Mount Noel, the Clisbako Caldera Complex, Lightning Peak, Black Dome Mountain, and many lava flows.