Gastrópodos y braquiópodos de la Formación Pituil en la quebrada de Barrancón, Carbonífero de la Precordillera de San Juan

TABOADA, ARTURO CÉSAR; MULE PATRICIA,; AREDES, MIGUEL

Tucumán

Jornada; Jornada Geológica Dirección de Geología Fundación Miguel Lillo; 2006

Fundación Miguel Lillo

Gastropods and brachiopods ofthe Pituil Formation at the Barrancón creek, Carboniferous of the Precordillera of San Juan. The gastropods Auriptygma? sp., Mourlonia? sp., Murchisonia? sp., Neoplatyteichum barrealensis (Reed), Ptychomphalina striata (Sowerby), Ptychomphalina turgentis Taboada, Straparollus (Straparollus) sp. and the brachiopods Anopliidae indet, Beecheria sp., Gonzalezius naranjoensis Taboada, Martinia? sp., Reticularia sp. indet, Spirifer sp., besides Orchesteropus atavus Frenguelli are identified in the Pituil Formation at the Barrancón creek, westem flank ofthe Precordillera ofSan Juan. All fossils known to this locality, including remains of the NBG flora and genera ofthe Apiculati Infraturma, come from the "Spotted Sandstone and Siltstone Member", which can be correlated with the widespread postglacial deposits of the lIla paleoclimatic subphase or threshold of an interglacial event in westem Argentina. In the Precordillera, this faunal association would be close to the top ofthe Levipustula levis Maxwell biozone or may be representing the first younger subsequent faunistic record with an estimative late bashkirian-early moscovian age.