Patagonian Desert whom 3,000 ended up in Buenos Aires separated by sexes to avoid their procreation. The boundary treaty of 1881 between Chile and Argentina bought most of the desert under definitive Argentine sovereignty; previously Chile had claimed varying now Argentine areas under claims of inherited colonial titles. In the few decades before and after 1900 the less dry parts of the Patagonian steppe experienced a sheep farming boom, transforming the region into one of the world's greatest exporters of ovine products. The area is sparsely populated today and those that do live here survive mainly by the raising of livestock such
Northern Patagonian Ice Field block that has been uplifted. To the west liest the Liquiñe-Ofqui Fault Zone, to the north the Exploradores Fault Zone and to the east the Cachet Fault. To the south there is possibly a zone of extensional faults around Tortel Fjord. Northern Patagonian Ice Field The Northern Patagonian Ice Field, located in southern Chile, is the smaller of two remnant parts in which the Patagonian Ice Sheet in the Andes Mountains of lower South America can be divided. It is completely contained within the boundaries of Laguna San Rafael National Park. The Northern Patagonian Ice Field is a vestige of