. The Andes of southern Peru; geographical reconnaissance along the seventy-third meridian. Yale Peruvian Expedition (1911); Physical geography; Geology. 186 THE ANDES OF SOUTHERN PERU 5. At the valley heads are a full complement of glacial features, such as cirques, hanging valleys, reversed slopes, terminal moraines, and valley trains. 6. Finally there is in all the valley bottoms a deep alluvial fill formed during the glacial period and now in process of dissection. Though there are in many places special features either re- motely related or quite unrelated to the principal enumerated type
. The Andes of southern Peru; geographical reconnaissance along the seventy-third meridian. Yale Peruvian Expedition (1911); Physical geography; Geology. 186 THE ANDES OF SOUTHERN PERU 5. At the valley heads are a full complement of glacial features, such as cirques, hanging valleys, reversed slopes, terminal moraines, and valley trains. 6. Finally there is in all the valley bottoms a deep alluvial fill formed during the glacial period and now in process of dissection. Though there are in many places special features either re- motely related or quite unrelated to the principal enumerated types, they belong to the class of minor forms to which relatively small attention will be paid, since they are in general of small ex- tent and of purely local interest. The block diagram represents all of these features, though of. Fig. 126—Block diagram of the typical physiographic features of the Peruvian Andes. necessity somewhat more closely associated than they occur in nature. Eeference to the photographs, Figs. 121-124, will make it clear that the diagram is somewhat ideal: on the other hand the photographs together include all the features which the diagram displays. In descending from any of the higher passes to the val- ley floor one passes in succession down a steep, well-like cirque at a glaciated valley head, across a rocky terminal moraine, then down a stair-like trail cut into the steep scarps which everywhere mark the descent to the main valley floors, over one after another of the confluent alluvial fans that together constitute a large part of the valley fill, and finally down the steep sides of the inner val- ley to the boulder-strewn bed of the ungraded 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, P
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