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Figure 1.16.
Diagrammatic cross-section showing inherited drainage being impressed on granite batholiths
during incision.
Figure 1.17.
Waterfalls in Río Xallas, Lézaro, Galicia, Spain.
remnants of these inner plains that allow defining the Fundamental Surface of Galicia (Vidal
Romaní, Yepes and Rodríguez, 1998). The Iberian atlantic rivers, as its cutdown, are so later to the
Atlantic Ocean opening that started about the Jurassic times. From that time the fluvial net inci-
sion is the answer to the creation of the new marine base level to the thining of the litosphere affected
by the system of listric faults and the slight isostatic rebound typical of the continental plate passive
margins. The incision process has not yet finished totally as it may be proved in the longitudinal
profiles of all the Iberian atlantic rivers (Fig. 1.16), and it is especially evident in the case of the
Xallas river, which meets the sea in a waterfall of 30 m of height (Vidal Romaní, Yepes and
Rodríguez, 1998), (Fig. 1.17).
 
 
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