Although snow amounts are obviously significantly lower, it is the present principal agent erosion and is accentuating this contrast. The present snow distribution patterns mirror those during the Pleistocene. According to this model, the Pleistocene glaciers accentuated a significant geomorphology asymmetry between eastern and western slopes of valley heads. As a result of this work, a model of slope dynamics for glaciated areas in the Iberian peninsula has been proposed. The conclusions show the relationship between old sediment and weathered mantle distribution and the effective capacity of present erosive activity on slopes. In addition, it studies the accumulation and permanence of the nival slope cover, as the fundamental source of water, the main present agent of erosion. This work analyzes the different landforms, and infers from them the Geomorphologic history of the Cirque. Research A/as carried out at the valley head of an area of glacial origin -Gredos Cirque-, situated on the northern side of this range, below its highest peak -Almanzor, which is 2,592 m in height. Sierra de Gredos is the highest mountain range in the Sistema Central which crosses the Iberian Peninsula from west to east at a latitude of 40° N.
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