LOS TOXODONTIDAE (TOXODONTA, NOTOUNGULAT A) DE LA FORMACIÓN ARROYO CHASICÓ (PLIOCENO INFERIOR) DE LA PROVINCIA DE BUENOS AIRES. CARACTERÍSTICAS GEOLÓGICAS

Rosendo Pascual

Abstract


This paper has been divided in three parts: (1) geological consíderations about the Arroyo Chasicó Formation (Lower Pliocene), from the SW of Buenos AIres Province, with a .brief summary a~out th.e. lith?logical char~cteristics, geographical distríbutíon, thickness, fossíl mammals and íts posítíon m a correlation chart of all the mammal. - bearling formations of Buenos Aires Province and the rest of the country; (2) systematícs and description of the Toxodontidae (Notoungulata) found in the outcrops of the Arroyo Chasicó; and (3) some considerations on the evidences upon which the plio - pleistocene Toxodontidae systematic has been based, including their possible phyrogenetic relationships.

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