PRESENCIA DE UNA GRAPTOFAUNA LLANDEILIANO - CARADOCIANA EN LA FORMACION ALCAPARROSA, DEL FLANCO OCCIDENTAL DE LA SIERRA DEL TONTAL (PRECORDILLERA DE SAN JUAN)

Osvaldo Schauer, Ricardo Varela, Carlos Cingolani, Alfredo Cuerda

Abstract


An Ordovician sequence (Late Llandeilian - Early Caradocian) has been found in the westem slope of the Sierra del Tontal (Alcaparrosa Formation). It is made up of sandstones and shales of about 500 m thick, partially intruded by basic volcanic rocks. Tha shales bears a graptolite association composed of Dicranograptus sp. Glyplograptus cf. G. intersitus Harris & Thomas, Retiograptus sp., and Climacograptus sp.

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