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.De Castro et al., 2016, p.532 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:Pastos Bons Formation at Fossilworks.org
Crocodylomorphs Crocodylomorphs of the Pasto Bons Formation Genus Species Location Stratigraphic position Material Notes Images Batrachomimus B. pastosbonensis A paralligatorid neosuchian
Fish Fishes of the Pasto Bons Formation Genus Species Location Stratigraphic position Material Notes Images Lophionotus L. parnaibensis A semionotid fish ParnaibaiaYabumoto, 2007 P. maranhaoensis A mawsoniid coelacanth Quasimodichthys Q. piauhyensis A semionotiform fish
Plants Plants of the Pasto Bons Formation Genus Species Location Stratigraphic position Material Notes Images Araucariaceae indet. Indeterminate
See also Takutu Formation, contemporaneous formation of northern Brazil and Guyana
References
Bibliography