Streams and glaciers have played a significant role in dissecting the massif, and its upper slopes are covered with snow and ice. Numerous feeder dikes to older units, formed when magma intrudes into a crack then crystallizes as a sheet intrusion, are exposed by deep erosion. Perkin's Pillar, a vertical tower of brecciated lava, represented an erosional remnant of the massif until its collapse in June 2005. More than 10 streams drain meltwater from the Mount Meager massif, including Capricorn Creek, Job Creek, No Good Creek, Angel Creek, Devastation Creek, Canyon Creek and Affliction Creek. The massif is located within one of British Columbia's many territorial divisions known as the Lillooet Land District.