The Andes of southern Peru . Fig. Fig. 130. Fig. 129—Composition of slopes at Puquiura, Vilcabamba Valley, elevation 9,000feet (2,740 m.). The second prominent spur entering the valley on the left has aflattish top unrelated to the rock structure. Like tire spurs on the right its blunt endand flat top indicate an earlier erosion cycle at a lower elevation. Fig. 130—Inclined Paleozoic strata truncated by an undulating surface of erosionat 15,000 feet, southwest of Cuzco.

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Keywords: ., bookcentury1900, bookdecade1910, bookidandeso, booksubjectgeology