Geology of Chile the Taitao Peninsula, the Peru–Chile Trench subduction zone is the boundary between the South American and Nazca Plates. At Taitao, the Chile Triple Junction and the Nazca Plate subduct the South American Plate. In Norte Grande the mountains form a series of plateaus, such as Puna de Atacama and the Altiplano. At a south latitude of 27 degrees, Chile's highest mountain (Ojos del Salado) reaches a height of . Below 42 degrees south, the Andes split into a fjord landscape and the highest mountain is Monte San Lorenzo at . As the mountains ebb, the snow line lowers; in the
Spanish Peaks (Montana) Spanish Peaks (Montana) The Spanish Peaks, avg el. , is a mountain range between Bozeman, Montana and Ennis, Montana in Gallatin and Madison County, Montana. It is a sub-range of the much larger Madison Range, itself a sub-range of the Rocky Mountains. The hydrological divide of the range serves as the border between Gallatin and Madison County, Montana. The Spanish Peaks are made up of 1.6 billion year-old gneiss, making them the oldest peaks in the Madison Range, predating the rest of the range by 50-60 million years. Gallatin Peak, el. 11,015 ft., is the highest peak in the group.