This caused regions of intense localised pressure in the ice field. The aircraft were forced to make emergency landings on the ice field. The glacier is at the south end of the Southern Patagonia Ice Field. The park includes a great part of the Southern Patagonian Ice Field. There are two known volcanoes under the ice field; Lautaro and Viedma. Why did "Titanic" proceed into the ice field at full speed? It forms when a glacier or ice field melts leaving a rocky plain. The southernmost Andes hosts the South Patagonian Ice Field are lower and narrower. At 10 pm the expedition ran into an impassable ice field and changed its course. Created in 1959, it covers an area of and includes the Northern Patagonian Ice Field. The Southern Patagonian Ice Field mantles a great portion of the park. The Columbia Icefield is the largest ice field in the Rocky Mountains. The glaciers, including Grey, Pingo and Tyndall, belong to the Southern Patagonia Ice Field. The Southern Patagonian Ice Field takes up the entire western side of the park. This ice field is the world's third largest reserve of fresh water.