AMONOIDEOS Y BIVALVOS BERRASIANOS DE LA CANTERA TRES LAGUNAS, CHUBUT

Eduardo B. Olivero

Abstract


BERRIASIAN AMMONITES AND BIVALVES FROM TRES LAGUNAS QUARRY, CHUBUT.
A molluscan fauna that includes Neocosmoceras ornatum sp. nov., Neocosmoceras sp. and Megatrigonia aff. conocardiifonnis (Krauss) from Tres Lagunas Quarry (Chubut) is described. On the basis of the presence of the ammonite genus Neocosmoceras Blanchet, known to be restricted to Occitanica and Boissieri Zones of the Berriasian in the SE of France, a more reliable correlation of the Tres Lagunas beds with the European Stages System is established. Lithological and structural features of the fossiliferous beds are briefly described.

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