ROSTROCONCHIA (MOLLUSCA, DIASOMA) EN LA FORMACIÓN SAN JUAN (ORDOVÍCICO TEMPRANO), PRECORDILLERA ARGENTINA
AbstractThe genera Ribeira and Tolmachovia are recorded for the first time in the San Juan Formation, increasing the faunal richness of this unit. A composite mold of the species Talacastella herrerai Sánchez, known up to now only from internal molds allows the description the external characters of this species.
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