Norris Mountain (Montana)
Norris Mountain () is located in the Lewis Range, Glacier National Park in the U.S. state of Montana. Norris Mountain is situated along the Continental Divide; it is the parent of Triple Divide Peak—the point at which North America's Arctic, Atlantic, and Pacific drainage basins converge—located east-southeast. Climate. Based on the Köppen climate classification, it is located in an alpine subarctic climate zone with long, cold, snowy winters, and cool to warm summers. Temperatures can drop below −10 °F with wind chill factors below −30 °F. Geology. Like other mountains in Glacier  National Park, it is composed of sedimentary rock laid down during the Precambrian to Jurassic periods. Formed in shallow seas, this sedimentary rock was initially uplifted beginning 170 million years ago when the Lewis Overthrust fault pushed an enormous slab of precambrian rocks thick, wide and long over younger rock of the cretaceous period.