Buena Vista Formation

The Buena Vista Formation is a Late Permian-Early Triassic geologic formation of the Cerro Largo Department in northeastern Uruguay. The fluvial sandstones and mudstones preserve temnospondyl and archosaur fossils.

Description
The Buena Vista Formation is characterized by reddish fine sandstone interbedded with lenticular clay layers and intraformational conglomerates deposited in a fluvial environment.

Fossil content
The following fossils have been reported from the formation:
 * Temnospondyls
 * Arachana nigra
 * Uruyiella liminea
 * Dvinosauria indet.
 * Mastodonsauridae indet.
 * Reptiles
 * Pintosaurus magnidentis
 * Archosauromorpha indet.