Irati Formation

Script error: No such module "Infobox".Script error: No such module "check for unknown parameters". Irati Formation is the name of a geological formation of the Paraná Basin in Brazil. It has previously been dated as Late Permian using palynomorphs, but is now dated as Early Permian using zircon ages obtained from bentonite layers. The base of the formation has been dated at 278.4 ± 2.2 Ma.^[1]^[2] Exposures of the Irati Formation are to be found in the South (Geopark of Paleorrota), southeastern Brazil and in the states of Goiás, Mato Grosso, São Paulo, Paraná, Santa Catarina, Rio Grande do Sul and Mato Grosso do Sul.^[1] The formation is part of the Passa Dios Group, underlying the Serra Alta Formation and overlying the Palermo Formation. The formation has been deposited in a restricted marine environment.^[3] The Irati Formation, with a maximum thickness of Script error: No such module "convert"., was defined and named by White in 1908.^[4]

Fossil content

Reptiles of the Irati Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Image
Brazilosaurus	B. sanpauloensis				A mesosaurid mesosaur	File:Brazilosaurus sanpauloensis.jpg
Mesosaurus	M. tenuidiens				A mesosaurid mesosaur	File:Mesosaurus BW.jpg
Stereosternum	S. tumidum				A mesosaurid mesosaur	File:Stereosternum.jpg

Crustaceans of the Irati Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Iraticaris	I. damiani
Myelontordoxylon	M. camposii
Permocaris	P. purperae
Pittinucaris	P. wuerdigae

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