The Andes of southern Peru . Fig. Fig. 33B. Fig. 53A—The smooth grassy slopes at the junction of the Yanatili (left) andUruhamba (right) rivers near Pabellon. Fig. o3B—Distribution of vegetation in the Urubamba Valley near Torontoy. Thepatches of timber in the backgiound occupy the shady sides of the spurs; the sunnyslopes are grass-covered; the valley floor is filled with thickets and patches of wood-land but not true forest. THE BORDER VALLEYS OF THE EASTERN ANDES 79 The one is forested, the other grass-cov-ered. Slopes that receive the noon andafternoon sun the greater part of the yea
The Andes of southern Peru . Fig. Fig. 33B. Fig. 53A—The smooth grassy slopes at the junction of the Yanatili (left) andUruhamba (right) rivers near Pabellon. Fig. o3B—Distribution of vegetation in the Urubamba Valley near Torontoy. Thepatches of timber in the backgiound occupy the shady sides of the spurs; the sunnyslopes are grass-covered; the valley floor is filled with thickets and patches of wood-land but not true forest. THE BORDER VALLEYS OF THE EASTERN ANDES 79 The one is forested, the other grass-cov-ered. Slopes that receive the noon andafternoon sun the greater part of the yearare hottest and therefore driest. Forplaces in 11° south latitude the sun is wellto the north six months of the year, nearlyoverhead for about two months, and to thesouth four months. Northwesterly as-pects are therefore driest and warmest,hence also grass-covered. In many placesthe line between grass and forest is de-veloped so sharply that it seems to be theartificial edge of a cut-over tract. This istrue especially if the reli
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Keywords: ., bookcentury1900, bookdecade1910, bookidandeso, booksubjectgeology
