ROSTROCONCHIA (MOLLUSCA, DIASOMA) EN LA FORMACIÓN SAN JUAN (ORDOVÍCICO TEMPRANO), PRECORDILLERA ARGENTINA

Teresa M Sánchez

Abstract


The 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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