The Andes of southern Peru, geographical reconnaissance along the seventy-third meridian . th America northof the ice fields of Patagonia. GLACIERS AND GLACIAL FORMS One of the most impressive sights in South America is atropical forest growing upon a glacial moraine. In many placesin eastern Bolivia and Peru the glaciers of the Ice Age were from5 to 10 miles long—almost the size of the Mer de Glace or thefamous Rhone glacier. In the Juntas Valley in eastern Boliviathe tree line is ~at 10,000 feet (3,050 m.), but the terminal moraineslie several thousand feet lower. In eastern Peru the glacier
The Andes of southern Peru, geographical reconnaissance along the seventy-third meridian . th America northof the ice fields of Patagonia. GLACIERS AND GLACIAL FORMS One of the most impressive sights in South America is atropical forest growing upon a glacial moraine. In many placesin eastern Bolivia and Peru the glaciers of the Ice Age were from5 to 10 miles long—almost the size of the Mer de Glace or thefamous Rhone glacier. In the Juntas Valley in eastern Boliviathe tree line is ~at 10,000 feet (3,050 m.), but the terminal moraineslie several thousand feet lower. In eastern Peru the glaciers inmany places extended down nearly to the tree line and in a fewplaces well below it. In the Cordillera Vilcapampa vast snow-fields and glacier systems were spread out over a summit areaas broad as the Southern Appalachians. The snowfields havesince shrunk to the higher mountain recesses; the glaciers haveretreated for the most part to the valley heads or the cirquefloors; and the lower limit of perpetual snow has been raised to15,500 feet. 204 v # • ? ? ?.-«-«, ~r?r 1. -. w^laMt£ii Fig. 132.
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Keywords: ., bookauthorbo, bookcentury1900, bookdecade1910, booksubjectgeology
