La Colonia Formation

Last updated
La Colonia Formation
Stratigraphic range: Campanian-Maastrichtian
~73–66  Ma
Quarry process 'Chubutinectes carmeloi.jpg
An outcrop of the La Colonia Formation on the Somún Curá plateau that is the type locality of Chubutinectes . Photographed in 2009.
Type Geological formation
Sub-unitsLower, Middle and Upper members
Underlies El Buitre & Sarmiento Formations
Overlies Cerro Barcino & Paso del Sapo Formations
ThicknessUp to 210–240 m (690–790 ft)
Thinning to 17 m (56 ft) around Telsen
Lithology
Primary Siltstone
Other Sandstone, claystone, conglomerate
Location
Coordinates 43°00′S67°30′W / 43.0°S 67.5°W / -43.0; -67.5
Approximate paleocoordinates 45°42′S53°48′W / 45.7°S 53.8°W / -45.7; -53.8
Region Chubut Province
CountryArgentina
Extent Cañadón Asfalto Basin
Type section
Named for Sierra La Colonia
Relief Map of Argentina.jpg
Lightgreen pog.svg
La Colonia Formation (Argentina)

The La Colonia Formation is a geological formation in Argentina whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation. [1]

Contents

Originally thought to be Campanian (c.73-72 million years ago) in age or earlier, studies of underlying formations have made a Maastrichtian (7266 million years ago) age more likely. [2]

Description

Paleogeography of the Late Cretaceous with La Colonia Formation indicated Paleogeography Gondwana - Late Cretaceous-Early Paleogene - around 85-63 Ma.jpg
Paleogeography of the Late Cretaceous with La Colonia Formation indicated

It is divided up into three distinct facies, the first is up to 16 metres (52 ft) thick and consists of conglomerate, the second is by far the thickest at over 100 metres (330 ft), consists of siltstone and claystone, with interbeds of claystone/shale and sandstone, the third is less than 10 metres (33 ft) thick and consists of clay, and probably represents a nearshore marine environment. [3]

The paleoflora was known for its aquatic components, Paleoazolla and Regnellidium. However, recent paleobotanical discoveries at the Cañadón del Irupé locality have revealed the presence of a more diverse range of plants associated with these water bodies, including pteridophytes, gymnosperms, and various angiosperms. Among these are fossil leaves and fruits assignable to Nelumbonaceae. [4]

Fossil content

Restoration of La Colonia Formation Titanomachya gimenezi & The La Colonia Formation.jpg
Restoration of La Colonia Formation

Turtles

Turtles from the La Colonia Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Chelidae gen. nov. [3] sp. nov.Norte de Cerro Bayo 2Skull and lower jaw; postcranial remainsRepresents a new genus of chelid
Patagoniaemys [3] P. gasparinae
  • Buitre Chico
  • in and around Norte de Cerro Bayo 2
  • Cerro Bosta
"skull fragments and several postcranial elements including a nearly complete vertebral column." [5] A meiolaniform
Patagoniaemys.png
aff. Yaminuechelys [3] Y. gasparinii
  • Norte de Cerro Bayo 2
  • Cerro Bosta
"Three specimens formed only by postcranial remains (mainly shell fragments)"
Yaminuechelys [6] Y. sulcipeculiaris
  • Norte de Cerro Bayo 1
  • Cerro Bosta

Fish

Fish from the La Colonia Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Metaceratodus [7] M. potkoorokiNorte de Cerro Bayo 1A ceratodontid lungfish

Plesiosaurs

Plesiosaurs from the La Colonia Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Chubutinectes [8] C. carmeloiSeveral vertebrae, ribs, partial pectoral and pelvic girdles, arm and leg bones, and gastrolithsAn elasmosaurid
Elasmosauridae [3] Indeterminate
  • Norte de Cerro Bayo 1
  • Cerro Bosta
"three postcranial specimens that preserve cervical, dorsal and caudal vertebrae, ribs and gastroliths and three vertebrae without collection number"
Kawanectes [9] K. lafquenianum"an incomplete mandible, nine cervical vertebrae, 14 dorsal vertebrae, three sacral vertebrae and five caudal vertebrae, and almost complete left fore limb, the isolated right humerus, both femora, ilia, pubes and the right ischium"An elasmosaurid
Kawanectes lafquenianum.png
Sulcusuchus [3] S. errainiCerro Bosta"part of skull and mandible"A polycotylid
Sulcusuchus erraini.png

Dinosaurs

Ornithiscians

Ornithischians from the La Colonia Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Ankylosauria [3] IndeterminateNorte de Cerro Bayo 2An osteoderm
Hadrosauroidea [3] IndeterminateNorte de Cerro Bayo 2Metatarsal fragment and two vertebral fragments

Sauropods

Sauropods from the La Colonia Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Somphospondyli [3] IndeterminateNorte de Cerro Bayo 2"Two fragmentary caudal vertebrae"
Titanomachya [10] T. gimeneziNorte de Cerro Bayo 2"Partial postcranial skeleton"A titanosaur sauropod
Titanomachya UDL.png

Theropods

Theropods from the La Colonia Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Carnotaurus C. sastreiPocho Sastre"Nearly complete skeleton and skull" [11] An abelisaurid [12] [13]
Carnotaurus Reconstruction (2022).png
Enantiornithine [14] IndeterminateA distal humerus
Koleken [3] [15] K. inakayaliNorte de Cerro Bayo 1"Quite complete and partially articulated skeleton"An abelisaurid.
Koleken UDL.png
Neornithes [16] IndeterminateA distal ulna
Theropoda [3] IndeterminateNorte de Cerro Bayo 2"Metatarsal fragments of a single individual"

Mammals

Over 300 mammal specimens have been found in the La Colonia Formation. [17]

Mammals of the La Colonia Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Argentodites A. coloniensis [18] A possible gondwanatherian or multituberculate
Coloniatherium C. cilinskii [19] A meridiolestidan
Ferugliotherium F. windhauseni [18] A possible gondwanatherian or multituberculate
Reigitherium R. bunodontum [20] A meridiolestidan

Snakes

Fossils of madtsoiids, and perhaps boids, have been found in the formation. [21]

Snakes from the La Colonia Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Alamitophis A. argentinus [21] Trunk vertebraA madtsoiid snake
Eomadtsoia E. ragei [22] A madtsoiid Snake

See also

Related Research Articles

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References

  1. Weishampel et al., 2004, pp.600-604
  2. Rauhut, 2003
  3. 1 2 3 4 5 6 7 8 9 10 11 Gasparini, Zulma; Sterli, Juliana; Parras, Ana; O'Gorman, José Patricio; Salgado, Leonardo; Varela, Julio; Pol, Diego (May 2015). "Late Cretaceous reptilian biota of the La Colonia Formation, central Patagonia, Argentina: Occurrences, preservation and paleoenvironments". Cretaceous Research. 54: 154–168. Bibcode:2015CrRes..54..154G. doi:10.1016/j.cretres.2014.11.010. hdl: 11336/19244 .
  4. Gandolfo, Maria A.; Cuneo, Ruben N. (February 2005). "Fossil Nelumbonaceae from the La Colonia Formation (Campanian–Maastrichtian, Upper Cretaceous), Chubut, Patagonia, Argentina". Review of Palaeobotany and Palynology. 133 (3–4): 169–178. Bibcode:2005RPaPa.133..169G. doi:10.1016/j.revpalbo.2004.09.007.
  5. Sterli & De la Fuente, 2011
  6. Carolina Oriozabala; Juliana Sterli; Marcelo S. De La Fuente (2020). "New species of the long-necked chelid Yaminuechelys from the Upper Cretaceous (Campanian–Maastrichtian) of Chubut, Argentina". Cretaceous Research. 106: Article 104197. Bibcode:2020CrRes.10604197O. doi:10.1016/j.cretres.2019.104197. S2CID   201336536.
  7. Karen M. Panzeri; Soledad Gouiric Cavalli; Nahuel A. Muñoz; Alberto L. Cione (2020). "Metaceratodus baibianorum, a new dipnoan species from the Upper Cretaceous of southern South America supported by traditional and geometric morphometric analyses". Journal of Vertebrate Paleontology. 40 (2): e1769640. Bibcode:2020JVPal..40E9640P. doi:10.1080/02724634.2020.1769640. S2CID   222210313.
  8. O’Gorman, José P.; Carignano, Ana Paula; Calvo-Marcilese, Lydia; Pérez Panera, Juan Pablo (2023-08-10). "A new elasmosaurid (Sauropterygia, Plesiosauria) from the upper levels of the La Colonia Formation (upper Maastrichtian), Chubut Province, Argentina". Cretaceous Research. 152: 105674. Bibcode:2023CrRes.15205674O. doi:10.1016/j.cretres.2023.105674. ISSN   0195-6671.
  9. O'Gorman, 2019
  10. Pérez-Moreno, A.; Salgado, L.; Carballido, J. L.; Otero, A.; Pol, D. (2024). "A new titanosaur from the La Colonia Formation (Campanian-Maastrichtian), Chubut Province, Argentina". Historical Biology: An International Journal of Paleobiology: 1–20. doi: 10.1080/08912963.2024.2332997 .
  11. "Table 3.1," in Weishampel et al., 2004, p.49
  12. Rauhut, 2004
  13. Leanza et al., 2004, p.72
  14. Lawver, Daniel R.; Debee, Aj M.; Clarke, Julia A.; Rougier, Guillermo W. (January 1, 2011). "A New Enantiornithine Bird from the Upper Cretaceous La Colonia Formation of Patagonia, Argentina". Annals of Carnegie Museum. 80 (1): 35–42. doi:10.2992/007.080.0104. S2CID   85015365.
  15. Pol, Diego; Baiano, Mattia Antonio; Černý, David; Novas, Fernando; Cerda, Ignacio A. (21 May 2024). "A new abelisaurid dinosaur from the end Cretaceous of Patagonia and evolutionary rates among the Ceratosauria". Cladistics. 40 (3): 307–356. doi: 10.1111/cla.12583 . PMID   38771085.
  16. Acosta Hospitaleche, C.; O'Gorman, J. P.; Panzeri, K. M. (2023). "A new Cretaceous bird from the Maastrichtian La Colonia Formation (Patagonia, Argentina)". Cretaceous Research. 150. 105595. Bibcode:2023CrRes.15005595A. doi:10.1016/j.cretres.2023.105595. S2CID   259059084.
  17. Rougier et al., 2009, p.225
  18. 1 2 Gurovich, Y.; Beck, R. (2009). "The phylogenetic affinities of the enigmatic mammalian clade Gondwanatheria". Journal of Mammalian Evolution. 16 (1): 25–49. doi:10.1007/s10914-008-9097-3. S2CID   42799370.
  19. Rougier, G.W.; Forasiepi, A.M.; Hill, R.V.; Novacek, M. (2009). "New mammalian remains from the Late Cretaceous La Colonia Formation, Patagonia, Argentina". Acta Palaeontologica Polonica. 54 (2): 195–212. doi: 10.4202/app.2006.0026 .
  20. Rougier, G. W.; Turazzinni, G. F.; Cardozo, M. S.; Harper, T.; Lires, A. I.; Canessa, L. A. (2021). "New Specimens of Reigitherium bunodontum from the Late Cretaceous La Colonia Formation, Patagonia, Argentina and Meridiolestidan Diversity in South America". Journal of Mammalian Evolution. 28 (4): 1051–1081. doi:10.1007/s10914-021-09585-2. S2CID   254704047.
  21. 1 2 Albino, Adriana M. (2000). "New record of snakes from the Cretaceous of Patagonia (Argentina)". Geodiversitas. 22 (2): 247–253.
  22. Raúl O. Gómez; Fernando F. Garberoglio; Guillermo W. Rougier (2019). "A new Late Cretaceous snake from Patagonia: Phylogeny and trends in body size evolution of madtsoiid snakes". Comptes Rendus Palevol. 18 (7): 771–781. doi:10.1016/j.crpv.2019.09.003. hdl: 11336/139595 . S2CID   213774502.

Bibliography

Further reading