Regional Geology and Tectonic History
- Red Mountain located near the western margin of the of the Stikine terrane
- Later accretion of outlying terranes added to the coast caused regional deformation
Red Mountain is located near the western margin of the Stikine terrane in the Intermontane Belt. The Stikine terrane formed between the mid-Paleozoic to the Middle Jurassic as an intra-oceanic island arc. The Stikine terrane was accreted on to the western margin of North America (170 M.a.). The later accretion of the outlying components of the Insular Superterrane (145 M.a.) caused the western portion of the Stikine terrane to undergo deformation.