The word peneplain comes from English peneplain , formed on the Latin word paene the English (almost) and word lime pit (Plaine). It indicates “almost flat”, a broad space with weak unevennesses, which results from long a erosion and coalescence from the catchment areas. It is about a whole of Talweg S and Interfluve S little marked with possibly of the residual reliefs (ridges S, Colline S, Monadnock S) along the watersheds. The peneplain thus constitutes the advanced stage of erosion due to the hydrographic networks.
This concept was developed by the first geomorphologist S, in particular the American William Morris Davis and the Argentinien Walther Penck, at the beginning of the 20th century. Its use implies the concept now disputed of Cycle of erosion, where a Orogenèse is followed of a long phase of stability Tectonique without renovation of the relief.
During and after its formation an assembly line undergoes erosion. Initially the increase of its root (the Moho) compensates for this erosion (rocks made up in-depth go up) then, when the increase is completed, the assembly line is eroded: one calls this form of relief a peneplain.
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