Fray Bentos Formation Explained

Fray Bentos Formation
Type:	Geological formation
Period:	Deseadan
Age:	Deseadan ~
Prilithology:	sandstone
Otherlithology:	siltstone
Namedfor:	Fray Bentos
Namedby:	Bossi
Year Ts:	1966
Country:
Unitof:	Paysandú Group
Underlies:	Raigón Formation
Overlies:	Asencio Formation
Extent:	Paraná Basin

The Fray Bentos Formation is a Deseadan^[1] geologic formation of the Paysandú Group in Uruguay and portions of Argentina,^[2] corresponding to the Paraná Basin.^{[3] [4]} It is composed of calcareous sandstones and siltstones with a pinkish-orange coloration. It outcrops in southwestern Uruguay (Canelones and Soriano Departments), the central and southeastern part of the province of Corrientes and northeast Entre Ríos.

Fossil content

The following fossils have been reported from the formation:

Mammals

• Argyrohyrax^[5]
• Cephalomyidae^[6]
• Eopachyrucos^{[7] [8]}
• Fiandraia
• Proborhyaena
• Prohegetotherium schiaffinoi^[9]
• Protypotherium^[10]
• Scarrittia^[11]
• Uruguaytherium beaulieui^[12]

Birds

• Devincenzia gallinali^[13]
• Devincenzia pozzi^[14]

See also

• List of fossiliferous stratigraphic units in Uruguay

Bibliography

• D. Perea, P. Toriño, and M. R. Ciancio. 2014. La presencia del Xenartro Palaeopeltis inornatus Ameghino, 1894, en la Formación Fray Bentos (Oligoceno Tardío), Uruguay. Ameghiniana 51(3):254-258
• M. Ubilla, D. Perea, and M. Bond. 1994. The Deseadan Land Mammal Age in Uruguay and the report of Scarrittia robusta nov. sp. (Leontiniidae, Notoungulata) in the Fray Bentos Formation (Oligocene - ? Lower Miocene). Geobios 27(1):95-102

Notes and References

1. http://www.fossilworks.org/cgi-bin/bridge.pl?action=displayStrata&geological_group=&formation=Fray%20Bentos&group_formation_member=Fray%20Bentos Fray Bentos Formation
2. Web site: Arquitectura de facies y ambientes deposicionales de la Formación Fray Bentos (Oligoceno) en Uruguay . Benvenuto . Andrés . CSIC . es . 2017 .
3. Bond et al., 1998, p.42
4. Tófalo & Morrás, 2009, p.680
5. Hernández Del Pino . Santiago . Seoane . Federico . Cerdeño . Esperanza . 2022 . New craniodental information and taxonomic decisions of the typotherians (Notoungulata) from the late Oligocene of Mendoza, central-western Argentina . Acta Palaeontologica Polonica . en . 67 . 10.4202/app.00974.2022 . 0567-7920. free. 11336/202725 . free .
6. http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=146410 Cephalomyidae
7. Dozo . María Teresa . Ciancio . Martín . Bouza . Pablo José . Martínez . Gastón . 2014 . New association of Paleogene Mammals in Eastern of Patagonia (Chubut Province, Argentina): biochronological and paleobiogeographical implications. . . 41 . 1. 10.5027/andgeoV41n1-a09. free. 11336/27088 . free .
8. Reguero . Marcelo A. . Ubilla . Martín . Perea . Daniel . 2003-06-17 . A new species of Eopachyrucos (Mammalia, Notoungulata, Interatheriidae) from the Late Oligocene of Uruguay . Journal of Vertebrate Paleontology . 23 . 2 . 445–457 . 10.1671/0272-4634(2003)023[0445:ANSOEM]2.0.CO;2 . 0272-4634.
9. http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=336542 Prohegetotherium schiaffinoi
10. Mones . A. . Álvaro Mones . Ubilla . M. . 1978 . La Edad Deseadense (Oligoceno inferior) de la Formación Fray Bentos y su contenido paleontológico, con especial referencia a la presencia de Proborhyaena cf. gigantea Ameghino (Marsupialia: Borhyaenidae) en el Uruguay. Nota preliminar. . Comunicaciones Paleontológicas del Museo de Historia Natural de Montevideo . 7 . 1 . 151–158.
11. http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=43405 Scarrittia
12. http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=270350 Uruguaytherium beaulieui
13. http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=181150 Devincenzia gallinali
14. http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=39465 Devincenzia pozzi