. The Andes of southern Peru; geographical reconnaissance along the seventy-third meridian. Yale Peruvian Expedition (1911); Physical geography; Geology. * 10,000: SEA LEVEL ^8_ 15,000' ' <===p» o. LO 1 1 Fig. 127—Topographic profiles across typical valleys of southern Peru. They are drawn to scale and the equality of gradient of the gentler upper slopes is so close that almost any curve would serve as a composite of the whole. These curves form the basis of the diagram, Fig. 128, whereby the amount of elevation of the Andes in late geologic time may be determined. The approxim
. The Andes of southern Peru; geographical reconnaissance along the seventy-third meridian. Yale Peruvian Expedition (1911); Physical geography; Geology. * 10,000: SEA LEVEL ^8_ 15,000' ' <===p» o. LO 1 1 Fig. 127—Topographic profiles across typical valleys of southern Peru. They are drawn to scale and the equality of gradient of the gentler upper slopes is so close that almost any curve would serve as a composite of the whole. These curves form the basis of the diagram, Fig. 128, whereby the amount of elevation of the Andes in late geologic time may be determined. The approximate locations of the profiles are as follows: 1, Antabamba; 2, Chuquibambilla; 3, upland south of Antabamba; 4, Apurimac Canyon above Pasaje; 5, Abancay; 6, Arma (Cordillera Vilcapampa) ; 7, divide above Huancarama; 8, Huascatay; 9, Huascatay, farther downstream; 10, Rio Pampas. The upper valley in 8 is still undissected; 7 is practically the same; 8a is at the level which 8 must reach before its side slopes are as gentle as at the end of the preceding interrupted cycle. (4,450 m.); several hundred miles farther north at Anta near Cuzco, 11,000 feet to 12,000 feet (3,600 to 3,940 m.), and Fig. 129 shows typical conditions in the Vilcabamba Valley along the route of the Yale Peruvian Expedition of 1911. The characteristic slopes so clearly represented in these four photographs are the most persistent topographic elements in the physiography of the Central Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bowman, Isaiah, 1878-1950; American Geographical Society of New York. New York, Published for the Americsn Geographical Society of New York by H. Holt
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Keywords: ., bookauthorbo, bookcentury1900, bookdecade1910, booksubjectgeology
