Paleoenvironmental reinterpretation of the Rio Bonito Formation (Permian, Paraná Basin) in the Iruí Coal Mine, Rio Grande do Sul, Brazil: Integration of facies analysis, ichnology and high-resolution sequence stratigraphy

Abstract

The Permian Rio Bonito Formation of the Parana Basin, southern Brazil, has been traditionally interpreted in terms of a fluvio-dominated deltaic model. Integration of facies analysis, ichnology, and high-resolution sequence stratigraphy suggests that this unit represents deposition in a tide-dominated, fluvio-estuarine valley system. The overlying Palermo Formation records deposition in open-marine environment