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Bajo Barreal Formation

Coordinates:45°18′S69°36′W/ 45.3°S 69.6°W/-45.3; -69.6
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Bajo Barreal Formation
Stratigraphic range:Mid Cenomanian-Late Turonian
~97–90Ma
TypeGeological formation
Unit ofChubut Group
UnderliesLago Colhué Huapí Formation
OverliesCastillo Formation
Lithology
PrimarySandstone
OtherClaystone,mudstone,conglomerate,tuff
Location
Coordinates45°18′S69°36′W/ 45.3°S 69.6°W/-45.3; -69.6
Approximate paleocoordinates51°36′S46°42′W/ 51.6°S 46.7°W/-51.6; -46.7
RegionChubut,Santa Cruz
CountryArgentina
ExtentGolfo San Jorge Basin
Type section
Named byTeruggi & Rossetto
Year defined1963
Bajo Barreal Formation is located in Argentina
Bajo Barreal Formation
Bajo Barreal Formation (Argentina)

TheBajo Barreal Formationis a geologicalformationin theGolfo San Jorge BasinofChubutandSanta Cruz,Argentina whose strata date back to theMiddle CenomaniantoLate Turonian.The formation was first described by Teruggi & Rossetto in 1963.[1]Thesandstones,claystones,mudstones,conglomeratesandtuffwere deposited in afluvialenvironment.[2]The upper part of formation is laterally equivalent to theYacimiento El TrébolandMeseta Espinosa Formationand the lower part to theLaguna Palacios,Cañadón SecoandComodoro Rivadavia Formations.The Bajo Barreal Formation is areservoir rockin the Golfo San Jorge Basin.[3]

Vertebrate paleofauna

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Dinosaurs

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Indeterminate abelisauroids and titanosaurs have been recovered from the formation

Ornithopods

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Ornithopodsreported from the Bajo Barreal Formation
Genus Species Stratigraphic position Material Notes Images
Notohypsilophodon[4] N. comodorensis[4] Lower "Vertebrae, partial fore- and hindlimb"[5] Anelasmarianornithopod.

Sauropods

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Sauropodsreported from the Bajo Barreal Formation
Genus Species Stratigraphic position Material Notes Images
Andesaurus[1] A.sp.[1] Lower The most basal member ofTitanosauria
Campylodoniscus[4][6] C. ameghinoi[4] 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 toLognkosauria
Epachthosaurus[4] E. sciuttoi[4] Lower "Vertebrae [and] partial illium."[9]
Katepensaurus K. goicoecheai Lower Partial skeleton A rebbachisaurid
Rebbachisauridae[10] Indeterminate Lower Dorsal vertebra Different fromKatepensaurus.
Sarmientosaurus[11] S. musacchioi Lower A skull Alithostrotiantitanosaur with a skull similar toBrachiosaurus

Theropods

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Theropodsreported from the Bajo Barreal Formation
Genus Species Stratigraphic position Material Notes Images
Abelisauridae[1] Indeterminate[1] Lower Maxilla Possibly distinct fromXenotarsosaurus.Estimated to be 6.21 metres (20.4 ft) long, larger thanXenotarsosaurus.[12]
Abelisauridae[13] Lower partial skeleton Different from all other comparable abelisaurids, but can't be compared withXenotarsosaurus.
Aniksosaurus[4] A. darwini[4] Lower A basal coelurosaur
Megaraptoridae[14] Indeterminate
  • Upper part of lower
  • Lowermost part of upper
Two partial skeletons
Xenotarsosaurus[4] X. bonapartei[4] Lower A vertebra and a nearly complete hind limb[15] An abelisaur.
Other fossils

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

See also

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References

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  1. ^abcdeCasal et al., 2016, p.55
  2. ^Bajo Barreal FormationatFossilworks.org
  3. ^Sywan, 2001, p.131
  4. ^abcdefghij"63.2 Provincia de Chubut, Argentina; 2. Bajo Barreal Formation," in Weishampel, et al. (2004). Page 602.
  5. ^"Table 18.1," in Weishampel, et al. (2004). Page 395.
  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. ^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.Bibcode:2020JSAES..9802460I.doi:10.1016/j.jsames.2019.102460.S2CID212808289.
  11. ^Martínez et al., 2016
  12. ^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.Bibcode:2017CrRes..69...71G.doi:10.1016/j.cretres.2016.09.001.ISSN0195-6671.
  13. ^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.
  14. ^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.doi:10.2992/007.086.0302.S2CID229355207.
  15. ^"Table 3.1," in Weishampel, et al. (2004). Page 49.
  16. ^Casal, 2016, p.58
  17. ^Estancia Laguna Palacios "2005 Quarry"atFossilworks.org
  18. ^6 km north of Estancia "Ocho Hermanos"atFossilworks.org

Bibliography

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Further reading

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  • G. Casal and L. Ibiricu. 2010. Materiales asignables aEpachthosaurusPowell, 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