Bajo Barreal Formation

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 formation was first described by Teruggi & Rossetto in 1963.[1] The sandstones, claystones, mudstones, conglomerates and tuff were deposited in a fluvial environment.[2] 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.[3]

Bajo Barreal Formation
Stratigraphic range: Mid Cenomanian-Late Turonian
~97–90 Ma
TypeGeological formation
Unit ofChubut Group
UnderliesLago Colhué Huapí Formation
OverliesCastillo Formation
Lithology
PrimarySandstone
OtherClaystone, mudstone, conglomerate, tuff
Location
Coordinates45.3°S 69.6°W / -45.3; -69.6
Approximate paleocoordinates51.6°S 46.7°W / -51.6; -46.7
RegionChubut, Santa Cruz
Country Argentina
ExtentGolfo San Jorge Basin
Type section
Named byTeruggi & Rossetto
Year defined1963
Bajo Barreal Formation (Argentina)

Vertebrate paleofauna

Dinosaurs

Indeterminate abelisauroids and titanosaurs have been recovered from the formation

Dinosaurs reported from the Bajo Barreal Formation
GenusSpeciesStratigraphic positionMaterialNotesImages
Abelisauridae[1] Indeterminate[1] Lower Maxilla Possibly distinct from Xenotarsosaurus. Estimated to be 6.21 metres (20.4 ft) long, larger than Xenotarsosaurus.[4]
Abelisauridae[5] Lower partial skeleton Different from all other comparable abelisaurids, but can't be compared with Xenotarsosaurus.
Aniksosaurus[6] A. darwini[6] Lower A basal coelurosaur
Andesaurus[1] A. sp.[1] Lower The most basal member of Titanosauria
Campylodoniscus[6][7] C. ameghinoi[6] Lower Maxilla with seven teeth.[8]
Clasmodosaurus[8] C. spatula[6] Jaw with seven teeth[8] A sauropod
Drusilasaura[9] 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[6] E. sciuttoi[6] Lower "Vertebrae [and] partial illium."[10]
Katepensaurus K. goicoecheai Lower Partial skeleton A rebbachisaurid
Megaraptoridae[11] Indeterminate Upper part of lower Two partial skeletons
Notohypsilophodon[6] N. comodorensis[6] Lower "Vertebrae, partial fore- and hindlimb"[12]
Rebbachisauridae[13] Indeterminate Lower Dorsal vertebra Different from Katepensaurus.
Sarmientosaurus[14] S. musacchioi Lower A skull A lithostrotian titanosaur with a skull similar to Brachiosaurus
Xenotarsosaurus[6] X. bonapartei[6] Lower A vertebra and a nearly complete hind limb[15]
Other fossils

Other fossils found in the formation include:[16][17][18]

See also

References
  1. Casal et al., 2016, p.55
  2. Bajo Barreal Formation at Fossilworks.org
  3. Sywan, 2001, p.131
  4. Grillo, Orlando Nelson; Delcourt, Rafael (2017-01-01). "Allometry and body length of abelisauroid theropods: Pycnonemosaurus nevesi is the new king". Cretaceous Research. 69: 71–89. doi:10.1016/j.cretres.2016.09.001. ISSN 0195-6671.
  5. Lamanna, Matthew C. (2012). "A new abelisaurid (Theropoda: Ceratosauria) skeleton from the Upper Cretaceous Bajo Barreal Formation of Chubut Province, Argentina". Journal of Vertebrate Paleontology. 32 (Supplement 2): 124.
  6. "63.2 Provincia de Chubut, Argentina; 2. Bajo Barreal Formation," in Weishampel, et al. (2004). Page 602.
  7. Haubold, H. & Kuhn, O., 1961, Lebensbilder und Evolution fossiler Saurier, Amphibien und Reptilien, Wittenberg : Ziemsen
  8. Huene, F. von, 1929, "Los Saurisquios y Ornitisquios del Cretaceo Argentino", Anales del Museo de La Plata, 3(2): 82-83
  9. 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.
  10. "Table 13.1," in Weishampel, et al. (2004). Page 268.
  11. Lamanna, Matthew C.; Casal, Gabriel A.; Martínez, Rubén D. F.; Ibiricu, Lucio M. (2020-11-30). "MEGARAPTORID (THEROPODA: TETANURAE) PARTIAL SKELETONS FROM THE UPPER CRETACEOUS BAJO BARREAL FORMATION OF CENTRAL PATAGONIA, ARGENTINA: IMPLICATIONS FOR THE EVOLUTION OF LARGE BODY SIZE IN GONDWANAN MEGARAPTORANS". Annals of Carnegie Museum. 86 (3): 255–294.
  12. "Table 18.1," in Weishampel, et al. (2004). Page 395.
  13. Ibiricu, Lucio M.; Casal, Gabriel A.; Martínez, Rubén D.; Alvarez, Bruno N.; Poropat, Stephen F. (2020). "New materials and an overview of Cretaceous vertebrates from the Chubut Group of the Golfo San Jorge Basin, central Patagonia, Argentina". Journal of South American Earth Sciences. 98: 102460. doi:10.1016/j.jsames.2019.102460.
  14. Martínez et al., 2016
  15. "Table 3.1," in Weishampel, et al. (2004). Page 49.
  16. Casal, 2016, p.58
  17. Estancia Laguna Palacios "2005 Quarry" at Fossilworks.org
  18. 6 km north of Estancia "Ocho Hermanos" at Fossilworks.org

Bibliography

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 Formación 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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