Bajo de la Carpa Formation

Summary

The Bajo de la Carpa Formation is a geologic formation of the Neuquén Basin that crops out in northern Patagonia, in the provinces of Río Negro and Neuquén, Argentina. It is the oldest of two formations belonging to the Río Colorado Subgroup within the Neuquén Group. Formerly, that subgroup was treated as a formation, and the Bajo de la Carpa Formation was known as the Bajo de la Carpa Member.[1]

Bajo de la Carpa Formation
Stratigraphic range: Mid-Late Santonian
~86–83 Ma
TypeGeological formation
Unit ofNeuquén Group
 Río Colorado Subgroup
UnderliesAnacleto Formation
OverliesRío Neuquén Subgroup
 Plottier Formation
ThicknessUp to 150 m (490 ft)
Lithology
PrimarySandstone
OtherMudstone, siltstone, paleosol
Location
Coordinates38°48′S 68°48′W / 38.8°S 68.8°W / -38.8; -68.8
Approximate paleocoordinates43°24′S 49°48′W / 43.4°S 49.8°W / -43.4; -49.8
RegionNeuquén & Río Negro Provinces
CountryArgentina
ExtentNeuquén Basin
Bajo de la Carpa Formation is located in Argentina
Bajo de la Carpa Formation
Bajo de la Carpa Formation (Argentina)

At its base, this formation conformably overlies the Plottier Formation of the older Río Neuquén Subgroup, and it is in turn overlain by the Anacleto Formation, the youngest and uppermost formation of the Neuquén Group.[2][3]

The Bajo de la Carpa Formation can reach 150 metres (490 ft) in thickness in some locations, and consists mainly of sandstones of various colors, all of fluvial origin, with thin layers of mudstone and siltstone in between. Geological features such as geodes, chemical nodules, impressions of raindrops, and paleosols (fossil soils) are commonly found in this formation as well.[1][3]

Fossil content edit

 
Comahuesuchus brachybuccalis
 
Notosuchus terrestris

Vertebrate fossils are abundant within the Bajo de la Carpa Formation:

Small nests with eggs inside, found in this formation, probably belonged to the bird Neuquenornis.[3] Fossil wasp nests have also been found in these rocks.[1][3]

See also edit

References edit

  1. ^ a b c Sánchez et al., 2006
  2. ^ Fossa Mancini et al., 1938
  3. ^ a b c d e Leanza et al., 2004
  4. ^ Martinelli et al., 2012
  5. ^ Lio et al., 2018
  6. ^ Filippi et al., 2018a
  7. ^ Coria et al., 2019
  8. ^ Filippi, Leonardo S.; Juárez Valieri, Rubén D.; Gallina, Pablo A.; Méndez, Ariel H.; Gianechini, Federico A.; Garrido, Alberto C. (2023). "A rebbachisaurid-mimicking titanosaur and evidence of a Late Cretaceous faunal disturbance event in South-West Gondwana". Cretaceous Research. doi:10.1016/j.cretres.2023.105754. ISSN 0195-6671.
  9. ^ Filippi et al., 2018b
  10. ^ Porfiri et al., 2018
  11. ^ Cruzado Caballero et al., 2019
  12. ^ Rozadilla, Sebastián; Agnolín, Federico; Manabe, Makoto; Tsuihiji, Takanobu; Novas, Fernando E. (September 2021). "Ornithischian remains from the Chorrillo Formation (Upper Cretaceous), southern Patagonia, Argentina, and their implications on ornithischian paleobiogeography in the Southern Hemisphere". Cretaceous Research. 125: 104881. Bibcode:2021CrRes.12504881R. doi:10.1016/j.cretres.2021.104881. ISSN 0195-6671.

Bibliography edit

  • Coria, Rodolfo A.; Ortega, Francisco; Arcucci, Andrea B.; Currie, Philip J. (2019). "A new and complete peirosaurid (Crocodyliformes, Notosuchia) from Sierra Barrosa (Santonian, Upper Cretaceous) of the Neuquén Basin, Argentina". Cretaceous Research. 95: 89–105. doi:10.1016/j.cretres.2018.11.008. S2CID 133671689.
  • Cruzado Caballero, P.; Gasca, J.M.; Filippi, L.S.; Cerda, I.; Garrido, A.C. (2019). "A new ornithopod dinosaur from the Santonian of Northern Patagonia (Rincón de los Sauces, Argentina)". Cretaceous Research. 98: 211–229. doi:10.1016/j.cretres.2019.02.014. S2CID 133830733.
  • Filippi, L.S.; Barrios, F.; Garrido, A.C. (2018a). "A new peirosaurid from the Bajo de la Carpa Formation (Upper Cretaceous, Santonian) of Cerro Overo, Neuquén, Argentina". Cretaceous Research. 83: 75–83. doi:10.1016/j.cretres.2017.10.021. Retrieved 2019-02-21.
  • Filippi, Leonardo S.; Méndez, Ariel H.; Gianechini, Federico A.; Juárez Valieri, Rubén D.; Garrido, Alberto C. (2018). "Osteology of Viavenator exxoni (Abelisauridae; Furileusauria) from the Bajo de la Carpa Formation, NW Patagonia, Argentina". Cretaceous Research. 83: 95–119. doi:10.1016/j.cretres.2017.07.019. hdl:11336/75315. Retrieved 2019-02-21.
  • Fossa Mancini, E.; Feruglio, E.; Yussen de Campana, J.C. (1938). "Una reunión de geólogos de YPF y el problema de la terminología estratigráfica ("A YPF geologists' reunion and the problem of stratigraphy terminology")". Boletín de Informaciones Petroleras. 15: 1–67.
  • Leanza, H.A.; Apesteguia, S.; Novas, F.E.; De la Fuente, M.S. (2004). "Cretaceous terrestrial beds from the Neuquén Basin (Argentina) and their tetrapod assemblages". Cretaceous Research. 25: 61–87. doi:10.1016/j.cretres.2003.10.005. Retrieved 2019-02-16.
  • Lio, Gabriel; Agnolin, Federico L.; Martinelli, Agustín G.; Ezcurra, Martín D.; Novas, Fernando E. (2018). "New specimen of the enigmatic, Late Cretaceous crocodyliform Neuquensuchus universitas sheds light on the anatomy of the species". Cretaceous Research. 83: 62–74. doi:10.1016/j.cretres.2017.09.014. Retrieved 2019-02-21.
  • Martinelli, Agustín G.; Sertich, Joseph J.W.; Garrido, Alberto C.; Praderio, Ángel M. (2012). "A new peirosaurid from the Upper Cretaceous of Argentina: Implications for specimens referred to Peirosaurus torminni Price (Crocodyliformes: Peirosauridae)". Cretaceous Research. 37: 191–200. doi:10.1016/j.cretres.2012.03.017. Retrieved 2019-02-21.
  • Porfiri, Juan D.; Juárez Valieri, Rubén D.; Santos, Domenica D.D.; Lamanna, Matthew C. (2018). "A new megaraptoran theropod dinosaur from the Upper Cretaceous Bajo de la Carpa Formation of northwestern Patagonia". Cretaceous Research. 89: 302–319. doi:10.1016/j.cretres.2018.03.014. S2CID 134117648. Retrieved 2019-02-21.
  • Sánchez, María Lidia; Heredia, Susana; Calvo, Jorge O. (2006). "Paleoambientes sedimentarios del Cretácico Superior de la Formación Plottier (Grupo Neuquén), Departamento Confluencia, Neuquén (Sedimentary paleoenvironments in the Upper Cretaceous Plottier Formation (Neuquen Group), Confluencia, Neuquén)". Revista de la Asociación Geológica Argentina. 61: 3–18. Retrieved 2019-02-16.
  • Gianechini, Federico A.; Méndez, Ariel H.; Filippi, Leonardo S.; Paulina-Carabajal, Ariana; Juárez-Valieri, Rubén D.; Garrido, Alberto C. (2021). "A New Furileusaurian Abelisaurid from La Invernada (Upper Cretaceous, Santonian, Bajo De La Carpa Formation), Northern Patagonia, Argentina". Journal of Vertebrate Paleontology. 40 (6): e1877151. doi:10.1080/02724634.2020.1877151.

Further reading edit

  • Leardi, Juan Martín; Pol, Diego; Brandoni de Gasparini, Zulma (2018). "New Patagonian baurusuchids (Crocodylomorpha; Notosuchia) from the Bajo de la Carpa Formation (Upper Cretaceous; Neuquén, Argentina): New evidences of the early sebecosuchian diversification in Gondwana". Comptes Rendus Palevol. 17 (8): 504–521. doi:10.1016/j.crpv.2018.02.002. S2CID 134148996. Retrieved 2019-02-21.