"The oldest record of Rostroconchia (Mollusca) from western Gondwana (Cordillera Oriental, northwestern Argentina)"
Abstract
"En el Paleozoico temprano de la Sierra de Cajas (provincia de Jujuy) se han iden ti ficado dos nuevas especies de Rostroconchia: Ribeiria jrancae n. sp., procedente de niveles del Carnbrico superior de la Formación Lampazar y Eopteria agustini n. sp., proveniente del Tremadociano temprano de la Formación Cardona!. El género Ribeiria (Orden Ribeirioida) se conoce desde el Cámbrico medio y Eopieria, un primitivo Conocardioida, está registrado desde el Cámbrico superior. Las nuevas especies definidas en este trabajo representan los más antiguos rostroconchos identificados en el oeste de Gondwana."Downloads
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