Earth:Bajo de la Carpa Formation
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Short description: Geological formation in Argentina
| Bajo de la Carpa Formation Stratigraphic range: Mid-Late Santonian ~86–83 Ma | |
|---|---|
| Type | Geological formation |
| Unit of | Neuquén Group Río Colorado Subgroup |
| Underlies | Anacleto Formation |
| Overlies | Río Neuquén Subgroup Plottier Formation |
| Thickness | Up to 150 m (490 ft) |
| Lithology | |
| Primary | Sandstone |
| Other | Mudstone, siltstone, paleosol |
| Location | |
| Coordinates | [ ⚑ ] : 38°48′S 68°48′W / 38.8°S 68.8°W |
| Paleocoordinates | [ ⚑ ] 43°24′S 49°48′W / 43.4°S 49.8°W |
| Region | Neuquén & Río Negro Provinces |
| Country | Argentina |
| Extent | Neuquén Basin |
  Bajo de la Carpa Formation (Argentina) | |
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]
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
Vertebrate fossils are abundant within the Bajo de la Carpa Formation:
- a snake-necked turtle, Lomalatachelys
- a lizard, Paleochelco
- the snake Dinilysia
- diverse crocodylomorphs occupying a range of ecological niches: Comahuesuchus, Cynodontosuchus, Lomasuchus, Gasparinisuchus,[4] Neuquensuchus universitas,[5] Notosuchus, Peirosaurus, Kinesuchus overoi,[6] and Barrosasuchus neuquenianus[7]
- titanosaurian sauropods including Bonitasaura, Inawentu, Overosaurus, Rinconsaurus, and Traukutitan[8]
- the ceratosaurian theropods Llukalkan, Velocisaurus, and Viavenator exxoni[9]
- the megaraptoran theropod Tratayenia rosalesi[10]
- the bird-like theropods Achillesaurus and Alvarezsaurus
- the enantiornithine bird Neuquenornis[3]
- the oldest known true flightless bird Patagopteryx
- the basal ornithopod Mahuidacursor[11]
- an ankylosaur[12]
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
- List of fossil sites
- List of dinosaur bearing rock formations
- Mata Amarilla Formation, contemporaneous formation of the Austral Basin
References
- ↑ 1.0 1.1 1.2 Sánchez et al., 2006
- ↑ Fossa Mancini et al., 1938
- ↑ 3.0 3.1 3.2 3.3 3.4 Leanza et al., 2004
- ↑ Martinelli et al., 2012
- ↑ Lio et al., 2018
- ↑ Filippi et al., 2018a
- ↑ Coria et al., 2019
- ↑ 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" (in en). Cretaceous Research. doi:10.1016/j.cretres.2023.105754. ISSN 0195-6671.
- ↑ Filippi et al., 2018b
- ↑ Porfiri et al., 2018
- ↑ Cruzado Caballero et al., 2019
- ↑ 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. doi:10.1016/j.cretres.2021.104881. ISSN 0195-6671. Bibcode: 2021CrRes.12504881R.
Bibliography
- 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.
- 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. http://rid.unrn.edu.ar/handle/20.500.12049/5562.
- 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. https://www.researchgate.net/publication/321023452. 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. https://www.researchgate.net/publication/318825390. 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. https://www.researchgate.net/publication/257047651. 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. https://www.researchgate.net/publication/320366505. 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. https://www.researchgate.net/publication/233755125. 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. https://www.researchgate.net/publication/323878344. 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. https://www.researchgate.net/publication/262615949. 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
- 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. https://www.researchgate.net/publication/323925185. Retrieved 2019-02-21.
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