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
Pioneer Mountains (Montana) Park, is available for the public to dig for quartz crystals. Pioneer Mountains (Montana) The Pioneer Mountains cover in Beaverhead County in southwestern Montana, USA. The highest peaks in this range include: The Pioneer Mountains are divided into two subranges by the paved Wise River Road: the East Pioneers and West Pioneers. The highest mountains in the entire range are in the East Pioneers - Tweedy Mountain and nearby Torrey Mountain, these two peaks are the highest on the Beaverhead National Forest. The two subranges are quite different from each other in appearance. The East Pioneers have rugged, heavily glaciated