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Slesse Mountain
Slesse Mountain, usually referred to as Mount Slesse, is a mountain just north of the US-Canada border, in the Cascade Mountains of British Columbia, near the town of Chilliwack. It is notable for its large, steep local relief. For example, its west face drops over to Slesse Creek in less than . It is also famous for its huge Northeast Buttress; see the climbing notes below. The name means "fang" in the Halkomelem language.〔Fred Beckey, ''Cascade Alpine Guide, Volume 3'' (Second Edition), The Mountaineers, 1995, ISBN 0-89886-423-2, p. 19 and pp. 165-177〕 Notable nearby mountains include Mount Rexford and Canadian Border Peak in British Columbia, and American Border Peak, Mount Shuksan, and Mount Baker, all in the US state of Washington.
==Geology==
Most of Mount Slesse is made up of granitic rocks related to the Chilliwack batholith, which intruded the region 26 to 29 million years ago after the major orogenic episodes in the region. This is part of the Pemberton Volcanic Belt, an eroded volcanic belt that formed as a result of subduction of the Farallon Plate starting 29 million years ago.〔(Cenozoic to Recent plate configurations in the Pacific Basin: Ridge subduction and slab window magmatism in western North America )〕〔(Miocene peralkaline volcanism in west-central British Columbia - Its temporal and plate-tectonics setting )〕〔(Catalogue of Canadian volcanoes: Franklin Glacier )〕 The primary rock comprising Slesse is grey diorite from the Batholith. However the summit ridge and the west face are composed of Darrington Phyllite, a metamorphic rock, produced by contact metamorphism with the rock of the Batholith and with an intrusion of granodiorite.〔
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