Abstract
The aim of this work is to present the oldest record of the genus Chasicotatus in northwest Argentina and the first record of a mammal, in fluvio-lakeside sediments of San Jose Formation (upper Miocene-middle Tortonian). It corresponds to a fragment of the dorsal carapace with articulated movable and fixed osteoderms, which comes from the proximity of the stream La Quenquiada, about 7 km southeast of Amaicha del Valle, Tafi del Valle department, Tucuman province, Argentina. The specimen is assigned to Chasicotatus ameghinoi by the external morphology of the movable and fixed osteoderms. The bearing levels of the San Jose Formation are correlated with the middle and upper levels of the Arroyo Chasico Formation, in Buenos Aires Province, and Los Banos Member (lower member) of Chiquimil Formation in the Hualfin-Belen valley, in Catamarca Province. Paleofloristic records allow to infer a warm, seasonal climate and an environment with open forests and savannas.
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