The Pastos Bons Formation is a Late Jurassic (Oxfordian to Kimmeridgian) geologic formation of the Parnaíba Basin in Maranhão, northeastern Brazil. The formation forms part of the sag phase of the basin. It overlies the Sardinha Formation and is overlain by the Mosquito Formation. The fluvial to lacustrine sandstones and shales have provided fossils of a coelacanth fish, Parnaibaia maranhaoensis and a paralligatorid named after the formation, Batrachomimus pastosbonensis. Fossil content The following fossils were reported from the formation: Reptiles Batrachomimus pastosbonensis Fish Parnaibaia maranhaoensis See also Takutu Formation, contemporaneous formation of northern Brazil and Guyana References Bibliography Geologic formations of Brazil Jurassic System of South America Jurassic Brazil Kimmeridgian Stage Oxfordian Stage Sandstone formations Shale formations Fluvial deposits Lacustrine deposits Paleontology in Brazil Formations Northeast Region, Brazil