Geologia E Paleontologia Do Membro Taquaral (Eopermiano) No Afloramento Do Rio Da Cabeça, Estado De São Paulo

Abstract

The Irati Formation, Permian (Cisuralian) of the Paraná Basin, stands out for important geological and paleontological characteristics. Two members are recognized, Taquaral and Assistência. Most of the Taquaral Member is composed of silty-clayey, gray sediments with plane-parallel laminations and at the base there are conglomeratic sandstones with large numbers of vertebrate fossils. The Cabeça River outcrop has the greatest thickness of the sandy facies, 43cm, the others are 9.5 and 15cm thick, but the lowest fossil density, 0,5fossil/cm². The present work discusses and characterizes the taphonomy and paleoictiofauna of this outcrop. Most fossils are teeth, scales and indeterminate bone parts of Actinopterygii (Palaeonisciformes) and indeterminate Xenacanthiformes teeth.

El Miembro Taquaral, Formación Irati (Cuenca del Paraná, Pérmico): síntesis de estudios paleontológicos

“…The Palaeonisciformes are known by teeth, scales and indeterminate bones. Teeth are usually conical and simple; however the size and surface ornamentation are variable in every units of the Paraná Basin (Würdig-Maciel, 1975, Richter et al, 1985, Chahud & Petri, 2008b, Chahud, 2020. The fossils are more abundant and diversified in the sandy facies (Chahud & Petri, 2008b than in silty-shale facies when only small scales and teeth are identified (Chahud & Petri, 2013a, 2013b.…”