Bajo Barreal Formation

Bajo Barreal Formation
Stratigraphic range: Mid Cenomanian-Late Turonian
~97–90 Ma
Type Geological formation
Unit of Chubut Group
Underlies Salamanca Formation
Overlies Castillo Formation
Lithology
Primary Sandstone
Other Claystone, mudstone, conglomerate, tuff
Location
Coordinates 45°18′S 69°36′W / 45.3°S 69.6°W / -45.3; -69.6Coordinates: 45°18′S 69°36′W / 45.3°S 69.6°W / -45.3; -69.6
Approximate paleocoordinates 51°36′S 46°42′W / 51.6°S 46.7°W / -51.6; -46.7
Region Chubut, Santa Cruz
Country  Argentina
Extent Golfo San Jorge Basin

The Bajo Barreal Formation is a geological formation in the Golfo San Jorge Basin of Chubut and Santa Cruz, Argentina whose strata date back to the Middle Cenomanian to Late Turonian. The sandstones, claystones, mudstones, conglomerates and tuff were deposited in a fluvial environment.[1] The upper part of formation is laterally equivalent to the Yacimiento El Trébol and Meseta Espinosa Formation and the lower part to the Laguna Palacios, Cañadón Seco and Comodoro Rivadavia Formations. The Bajo Barreal Formation is a reservoir rock in the Golfo San Jorge Basin.[2]

Vertebrate paleofauna

Dinosaurs

Dinosaur remains are among the fossils that have been recovered from the formation.[3] Dinosaur remains include the abelisaurid theropod Xenotarsosaurus bonapartei, as well as indeterminate teeth belonging to carcharodontosaurids and dromaeosaurids.[4]

Dinosaurs reported from the Bajo Barreal Formation
Genus Species Location Stratigraphic position Material Notes Images

Aniksosaurus[5]

A. darwini[5]

Lower

A basal coelurosaur.
Epachthosaurus

Campylodoniscus[5][6]

C. ameghinoi[5]

Lower

Maxilla with seven teeth.[7]

Drusilasaura[8]

D. deseadensis

Upper

"four dorsal vertebrae, one sacral vertebra, six caudal vertebrae, left scapula, dorsal rib fragments, two haemapophyses and indeterminate fragments."

A titanosaur belonging to Lognkosauria.

Epachthosaurus[5]

E. sciuttoi[5]

Lower

"Vertebrae [and] partial illium."[9]

Notohypsilophodon[5]

N. comodorensis[5]

Lower

"Vertebrae, partial fore- and hindlimb."[10]

Sarmientosaurus[11]

S. musacchioi

Lower

A skull

A lithostrotian titanosaur.

Xenotarsosaurus[5]

X. bonapartei[5]

Lower

A vertebra and a nearly complete hind limb.[12]
Other fossils

Other fossils found in the formation include:[13][14]

See also

References

  1. ↑ Bajo Barreal Formation at Fossilworks.org
  2. ↑ Sywan, 2001, p.131
  3. ↑ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Cretaceous, South America)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 600-604. ISBN 0-520-24209-2.
  4. ↑ Casal, G., Candeiro, C.R.A., Martínez, R., Ivany, E., and Ibiricu, L. (2009). "Dientes de Theropoda (Dinosauria: Saurischia) de la Formación Bajo Barreal, Cretácico Superior, Provincia del Chubut, Argentina." Geobios, doi:10.1016/j.geobios.2009.03.002.
  5. 1 2 3 4 5 6 7 8 9 10 "63.2 Provincia de Chubut, Argentina; 2. Bajo Barreal Formation," in Weishampel, et al. (2004). Page 602.
  6. ↑ Haubold, H. & Kuhn, O., 1961, Lebensbilder und Evolution fossiler Saurier, Amphibien und Reptilien, Wittenberg : Ziemsen
  7. ↑ Huene, F. von, 1929, "Los Saurisquios y Ornitisquios del Cretaceo Argentino", Anales del Museo de La Plata, 3(2): 82-83
  8. ↑ César Navarrete, Gabriel Casal and Rubén Martínez (2011). "Drusilasaura deseadensis gen. et sp. nov., a new titanosaur (Dinosauria-Sauropoda), of the Bajo Barreal Formation, Upper Cretaceous of north of Santa Cruz, Argentina". Revista Brasileira de Paleontologia 14 (1): 1-14. doi:10.4072/rbp.2011.1.01.
  9. ↑ "Table 13.1," in Weishampel, et al. (2004). Page 268.
  10. ↑ "Table 18.1," in Weishampel, et al. (2004). Page 395.
  11. ↑ Rubén D. F. Martínez, Matthew C. Lamanna, Fernando E. Novas, Ryan C. Ridgely, Gabriel A. Casal, Javier E. Martínez, Javier R. Vita & Lawrence M. Witmer (2016) A Basal Lithostrotian Titanosaur (Dinosauria: Sauropoda) with a Complete Skull: Implications for the Evolution and Paleobiology of Titanosauria. PLoS ONE 11(4): e0151661. doi:10.1371/journal.pone.0151661 http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0151661
  12. ↑ "Table 3.1," in Weishampel, et al. (2004). Page 49.
  13. ↑ Estancia Laguna Palacios "2005 Quarry" at Fossilworks.org
  14. ↑ 6 km north of Estancia "Ocho Hermanos" at Fossilworks.org

Bibliography

  • Sylwan, Claudio A. 2001. Geology of the Golfo San Jorge Basin, Argentina. Journal of Iberian Geology 27. 123-157. Accessed 2018-09-04.
  • Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp.  ISBN 0-520-24209-2.

Further reading

  • G. Casal and L. Ibiricu. 2010. Materiales asignables a Epachthosaurus Powell, 1990 (Sauropoda: Titanosauria), de la Formación Bajo Barreal, Cretácico Superior, Chubut, Argentina [Materials assignable to Epachthosaurus Powell, 1990 (Sauropoda: Titanosauria), from the Bajo Barreal Formation, Upper Cretaceous, Chubut, Argentina]. Revista Brasileira de Paleontologia 13(3):247-256
  • L. M. Ibiricu, G. A. Casal, R. D. Martinez, M. C. Lamanna, M. Luna and L. Salgado. 2013. Katepensaurus goicoecheai, gen. et sp. nov., a Late Cretaceous rebbachisaurid (Sauropoda, Diplodocoidea) from central Patagonia, Argentina. Journal of Vertebrate Paleontology 33(6):1351-1366
  • L. M. Ibiricu, G. A. Casal, M. C. Lamanna, R. D. Martínez, J. D. Harris and K. J. Lacovara. 2012. The southernmost records of Rebbachisauridae (Sauropoda: Diplodocoidea), from early Late Cretaceous deposits in central Patagonia. Cretaceous Research 34:220-232
  • R. D. Martínez, F. E. Novas, and A. Ambrosio. 2004. Abelisaurid remains (Theropoda, Ceratosauria) from southern Patagonia. Actas I del Congreso Ltinoamericano de Paleontología de Vertebrados. Ameghiniana 41(4):577-585
  • R. D. Martínez and F. E. Novas. 1997. Un nuevo tetanuro (Dinosauria: Theropoda) de la Formación Bajo Barreal (Cretácico Superior), Patagonia [A new tetanuran (Dinosauria: Theropoda) from the Bajo Barreal Formation (Upper Cretaceous), Patagonia]. Ameghiniana 34(4):538
  • R. D. Martínez, A. Maure, M. Oliva and M. Luna. 1993. Un maxilar de Theropoda (Abelisauria) de la Formacion Bajo Barreal, Cretacico Tardio, Chubut, Argentina [A theropod (Abelisauria) maxilla from the Bajo Barreal Formation, Late Cretaceous, Chubut, Argentina]. Ameghiniana 30(1):109-110
  • J. C. Sciutto and R. D. Martínez. 1994. Un nuevo yacimiento fosilífero de la Formación Bajo Barreal (Cretacico Tardio) y su fauna de saurópodos [A new fossiliferous locality in the Bajo Barreal Formation (Late Cretaceous) and its sauropod fauna]. Naturalia Patagonica, Ciencias de la Tierra 2:27-47
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