Abstract
The late Pleistocene-early Holocene sequence at the Arroyo Seco 2 is one of the most complete record in Pampean Region. Four stratigraphic units are distinguished, three of which contain abundant small mammals fossil. Fossil bones from these units are analysed in order to determine the taphonomic processes and habitat present during the accumulation of their fauna remains. Most of the fossil bones are broken after burial. Bones from the deeper units are recovered of manganese (Mn) produced by the water level oscillations consequence of the successive swamping. Three species of armadillo ( Chaetophractus villosus, Dasypus hybridus and Zaedyus pichiy ) and four rodents ( Akodon azarae, Rheitrodon auritus, Ctenomys talarum and Lagostomus maximus ) are present. Record of micro-mammal plus megafauna evidence show a transition from temperate and semiarid to more humid conditions between 12,000 and 8,500 yrs BP.
Highlights
The late Pleistocene-early Holocene sequence at the Arroyo Seco 2 is one of the most complete record in Pampean Region
Las dataciones radiocarbónicas de este componente se ubican entre 7.320 y 11.590 años AP
Los armadillos (Mammalia, Dasypodidae) de La Toma (Partido de Pringles) y otros sitios arqueológicos de la Provincia de Buenos Aires
Summary
Cular los resultados del lavado y tamizado de los sedimentos, han permitido recuperar una gran cantidad de restos óseos de micro y mesomamíferos en toda la columna estratigráfica. El objetivo del presente trabajo es dar a conocer la fauna de micro y mesomamíferos del sitio Arroyo Seco 2. Muchas de estas especies son consideradas como buenas indicadoras paleoclimáticas (Pardiñas el al., 1991; Tonni el al., 1993; Pardiñas y Tonni, 1993; Pardiñas y Lezcano, 1995). En consecuencia se contrastarán las reconstrucciones paleoclimáticas elaboradas sobre la base de datos geológicos, faunísticos e isótopos estables (Tonni y Fidalgo, 1978; Prado el al., 1987; Bonadonna el al., 1995) con las evidencias de los micromamíferos. Los materiales obtenidos en la campaña 1992 han sido analizados a fin de determinar qué procesos tafonómicos afectaron la acumulación de estos restos faunísticos y la formación del sitio
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