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