The Buena Vista Formation is a

Late Permian Late or LATE may refer to: Everyday usage * Tardy, or late, not being on time * Late (or the late) may refer to a person who is dead Music * ''Late'' (The 77s album), 2000 * Late (Alvin Batiste album), 1993 * Late!, a pseudonym used by Dave Groh ...

Early Triassic The Early Triassic is the first of three epochs of the Triassic Period of the geologic timescale. It spans the time between 251.9 Ma and Ma (million years ago). Rocks from this epoch are collectively known as the Lower Triassic Series, which ...

geologic

formation Formation may refer to: Linguistics * Back-formation, the process of creating a new lexeme by removing or affixes * Word formation, the creation of a new word by adding affixes Mathematics and science * Cave formation or speleothem, a secondary ...

of the

Cerro Largo Department Cerro Largo Department () is a Departments of Uruguay, department of Uruguay. Its capital is Melo, Uruguay, Melo. It is located in the east of the country, bordering Brazil to its northeast with Rio Yaguaron, Yaguaron River as the natural border, ...

in northeastern

Uruguay Uruguay, officially the Oriental Republic of Uruguay, is a country in South America. It shares borders with Argentina to its west and southwest and Brazil to its north and northeast, while bordering the Río de la Plata to the south and the A ...

. The

fluvial A river is a natural stream of fresh water that flows on land or inside caves towards another body of water at a lower elevation, such as an ocean, lake, or another river. A river may run dry before reaching the end of its course if it ru ...

sandstone Sandstone is a Clastic rock#Sedimentary clastic rocks, clastic sedimentary rock composed mainly of grain size, sand-sized (0.0625 to 2 mm) silicate mineral, silicate grains, Cementation (geology), cemented together by another mineral. Sand ...

s and

mudstone Mudstone, a type of mudrock, is a fine-grained sedimentary rock whose original constituents were clays or muds. Mudstone is distinguished from ''shale'' by its lack of fissility.Blatt, H., and R.J. Tracy, 1996, ''Petrology.'' New York, New York, ...

s preserve

temnospondyl Temnospondyli (from Greek language, Greek τέμνειν, ''temnein'' 'to cut' and σπόνδυλος, ''spondylos'' 'vertebra') or temnospondyls is a diverse ancient order (biology), order of small to giant tetrapods—often considered Labyrinth ...

and

archosaur Archosauria () or archosaurs () is a clade of diapsid sauropsid tetrapods, with birds and crocodilians being the only extant taxon, extant representatives. Although broadly classified as reptiles, which traditionally exclude birds, the cladistics ...

fossils.

Description

The Buena Vista Formation is characterized by reddish fine

interbedded with lenticular clay layers and intraformational conglomerates deposited in a

environment Environment most often refers to: __NOTOC__ * Natural environment, referring respectively to all living and non-living things occurring naturally and the physical and biological factors along with their chemical interactions that affect an organism ...

Fossil content

The following fossils have been reported from the formation:Buena Vista Formation
at

Fossilworks Fossilworks was a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database, a large relational database assembled by hundreds of paleontologists from around the world. History Fossilworks was cr ...

.orgPineiro et al., 2003 *

Temnospondyl Temnospondyli (from Greek language, Greek τέμνειν, ''temnein'' 'to cut' and σπόνδυλος, ''spondylos'' 'vertebra') or temnospondyls is a diverse ancient order (biology), order of small to giant tetrapods—often considered Labyrinth ...

s ** ''

Arachana nigra ''Arachana'' is an extinct genus of rhinesuchid-like temnospondyl known from the Early Triassic Buena Vista Formation of northeastern Uruguay. ''Arachana'' was first named by Graciela Piñeiro, Alejandro Ramos and Claudia Marsicano in 2012 and t ...

'' ** '' Uruyiella liminea'' ** Dvinosauria indet. ** Mastodonsauridae indet. *

Reptile Reptiles, as commonly defined, are a group of tetrapods with an ectothermic metabolism and Amniotic egg, amniotic development. Living traditional reptiles comprise four Order (biology), orders: Testudines, Crocodilia, Squamata, and Rhynchocepha ...

s ** '' Pintosaurus magnidentis'' ** Archosauromorpha indet.

References

Bibliography

* {{Authority control Geologic formations of Uruguay Permian System of South America Triassic System of South America Permian Uruguay Triassic Uruguay Sandstone formations Mudstone formations Conglomerate formations Fluvial deposits Formations Fossiliferous stratigraphic units of South America Paleontology in Uruguay Formations

Description

Fossil content

See also

References

Bibliography