Strepsodiscus austrinus Pinilla et al. y faunas asociadas del Cámbrico tardío del Angosto de la Quesera, provincia de Salta

STREPSODISCUS AUSTRINUS PINILLA ET AL. (GASTROPODA, BELLEROPHONTOIDEA) Y FAUNAS ASOCIADAS DEL CAMBRICO TARDIO DEL ANGOSTO DE LA QUESERA, PROVINCIA DE SALTA. A paleontological study on the Lampazar Formation outcropping at Angosto de la Quesera locality, western Cordillera Oriental, Salta Province, is achieved. The occurrence of the genus Strepsodiscus Knight (Gastropoda, Bellerophontoidea) supports a latest Cambrian age for the formation. This paper includes an analysis of the functional morphology of Strepsodiscus austrinus Pinilla et al., which is associated with some characteristic trilobites of the Parabolina frequens argentina Zone [Parabolina (Neoparabolina) frequens (Barrande), Olenidae indet., Micragnostus sp.], Hyolitha gen et sp. indet, crinoid plates, and trace fossils of the archetypical Cruziana Ichnofacies.