Abstract
Abstract Research on the faunal evolution of the marine Neogene in north-central Chile (D. H.) has shown the existence of an important sedimentary hiatus between the upper Miocene and the upper Pliocene. Other work carried out independently (R. P.) shows that the lower Pliocene corresponds exactly to a period of great activity of exogenetic forces on the continent related to very low sea level. Two basic facts appear in the light of these observations: on the one hand the existence of continental deposits of the lower Pliocene in the bottoms of present valleys, on the other hand the necessity of adopting, to account for Plio-Quaternary events, a 'long' chronology that refers to the beginning of the Pliocene the great dislocations that have given the Andean system its mountainous proportions.
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