-A group of isolated occurrences of sedimentary rocks located over the Sul-Rio-Grandense Shield, fi rst described as a temporally intermediate unit between the upper deposits of Camaquã Basin and the lower deposits of Paraná Basin was named Caneleiras Formation, with an inferred Devonian age. Later, the discovery of vertebrate fossils (mainly rhynchosaurs) allowed the stratigraphical assignment of these rocks to the Triassic, correlated to the Santa Maria Formation. However, none of the fossils were complete enough to allow a precise taxonomic assignment, hampering more detailed biostratigraphic correlations. This work reports a new rhynchosaur specimen from an outcrop located at Campinas River, near Santana da Boa Vista, Rio Grande do Sul, Brazil. The presence of one maxillary groove allows assigning the material to the genus Hyperodapedon, index fossil of the Hyperodapedon AZ, which corresponds to the base of the Candelária Sequence, Santa Maria Supersequence. This occurrence shows that, at least on Upper Triassic, the depositional area of the Santa Maria Sequence extended southward of the actual outcrop belt, covering portions of the Shield.

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