Rio do Rasto Formation

The Rio do Rasto Formation is a Late Permian sedimentary geological formation in the South Region of Brazil. The official name is Rio do Rasto, although in some publications it appears as "Rio do Rastro".
Geography.
It is found mainly in the Brazilian states of Santa Catarina, Paraná, and Rio Grande do Sul. It was formed during the Late Permian epoch of the Permian period.
Fossil content.
The following fossils have been uncovered from the formation: