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.

Buena Vista Formation
Stratigraphic range: Late Permian-Early Triassic ~259.5–247.2 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Underlies	Tacuarembó Formation
Overlies	Yaguarí Formation
Lithology
Primary	Sandstone, mudstone
Other	Conglomerate
Location
Coordinates	32.3°S 54.1°W / -32.3; -54.1
Approximate paleocoordinates	40.2°S 15.7°W / -40.2; -15.7
Region	Cerro Largo Department
Country	Uruguay
Extent	Norte Basin
Buena Vista Formation (Uruguay)

Description

The Buena Vista Formation is characterized by reddish fine sandstone interbedded with lenticular clay layers and intraformational conglomerates deposited in a fluvial environment.^[1]

Fossil content

The following fossils have been reported from the formation:^[2][1]

• Temnospondyls
  • Arachana nigra^[3]
  • Uruyiella liminea
  • Dvinosauria indet.
  • Mastodonsauridae indet.
• Reptiles
  • Pintosaurus magnidentis
  • Archosauromorpha indet.

See also

• List of fossiliferous stratigraphic units in Uruguay