Cotton grass in the foreground with Albatross providing an imposing backdrop. The Arrigetch Peaks pluton is a gneiss formed by metamorphism of crystalline igneous rock and is characterised by high, rugged relief and an alpine environment. Endicott Mountains. Central Brooks Range, Gates of the Arctic National Park and Preserve, (4 x 5 inch fuji velvia film, Linhof Technika IV camera, Rodenstock Grandagon 90 mm lens), 2004.