Evolucion geomorfologica de la superficie de erosion rlooo en los LLanos de Castro Caldelas (Ourense)

Abstract

We present the morphological analysis of a sector of the Rloo, replane. The sector chosen is hanging above the current fluvial network. This fact allows us to attribute a semi-functional character to the courses which drain the replane. Eleven levels of erosive terraces have been identified, which correspond to the degradation of the initial replane. The geometry of the network allows us to suppose that the current organisation was reached by means of successive captures. On the other hand, two layouts of the network have been distinguished (centripetal and in bayonet). The centripetal network defines a hollow surface and the bayonet network a surface in stepped inclines. We propose that both morphologies correspond to different stages of a same process: the hollowing out of the R1,. Lastly we propose the hypothesis of a tectonic pattem of the R₁₀₀, for the origin of the Llanos.