LOS DEPOSITOS DE LA "TRANSGRESION ENTRERRIANA" (MIOCENO DE ARGENTINA, BRASIL Y URUGUAY)

Sergio Martínez

Abstract


From deposits ascribed bivalves and gastropods "entrerrian transgression" are compared by mean of clustering analysis, diversity, trophic mode and mode of life. It is mainly concluded that Paraná-Colonia and Chuy-Cuenca de Pelotas are the areas more closeley related. Buenos Aires has certain affinities with Paraná Colonia, whilst the relationships of these to the northem Patagonia area are not clear. A stable shalow marine enviroment is inferred, except for the Chuy area where one involving higher energy level is suggested.

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