Levantamento de afloramentos fossilíferos na Ilha de Itaparica, Bacia do Recôncavo, Estado da Bahia

Abstract

The Reconcavo Basin has a very diverse fossil record, having registered the presence of fossils of plants, invertebrates and vertebrates, including some teleosts endemic to this basin. This study was developed with the objective of conduct a survey of fossiliferous outcrops of the island of Itaparica, Recôncavo Basin, as well as presenting some of fossil finds. Initially, a literature search was conducted about the occurrence of paleovertebrados in said basin. Subsequently, field outputs were performed to verify the correct geographical positioning of outcrops cited in the literature. The efforts of field were concentrated on the island of Itaparica, in outcrops of lacustrine paleoenvironment Maracangalha of Formation (Early Cretaceous). Prospecting and samplings were performed in eight outcrops spread over four villages (Manguinhos, Bom Despacho, Penha and Gamboa). All the outcrops visited were geocoded and mapped. We collected in these points, fossils of fishes, including fish scales and fragments of ribs, vertebrae and skull, and some specimens semiarticulados. None complete sample was found due to character fissile Maracangalha shales of sandstones of the deformation Member Caruaçu by gravity flows. Found themselves also several fragments vegetable carbonificados ichnofossils possible, thereby demonstrating the great potential of fossiliferous Reconcavo Basin, the area investigated.