The results of studies of vertebrate and crustracea remains from quarries for dolomite sou buffer at Perolândia (Jataí Municipality) and Boa Vista (Montevidiu Municipality), State of Goiás, Brazil, are presented in this paper. These dolomites are here correlated to the Assistência Member of the Permian Irati Formation of the State of São Paulo. The fossils were identified as Stereosternum tumidum Cope 1886 (Reptilia) and Liocaris huenei Beurlen 1931 (Crustacea). fchnofossik and organic animal remains were not classified. The Guapiara Alignment, according to the proposition here presented, might be a barrier during the Irati deposition so the Assistência Member with the reptils Stereosternum and Brazilosaurus was restricted to the north of this alignment South of this alignment the Irati sediments were mainly shales bearing the réptil Mesosaurus brasiliensis.
