Toqui Formation
Stratigraphic range: Tithonian
~
Cast of Chilesaurus from the Toqui Formation
TypeGeological formation
Unit ofCoihaique Group
UnderliesKatterfeld Formation
OverliesIbáñez Formation
Thickness300–320 m (980–1,050 ft)
Lithology
PrimaryConglomerate, sandstone, tuffite, ignimbrite
Location
Coordinates46°36′S 72°24′W / 46.6°S 72.4°W / -46.6; -72.4
Approximate paleocoordinates44°48′S 32°24′W / 44.8°S 32.4°W / -44.8; -32.4
RegionAysén Region
Country Chile
Toqui Formation is located in Chile
Toqui Formation
Toqui Formation (Chile)

The Toqui Formation is a geological formation in the Aysén Region of southern Chile. It has been dated to the Tithonian stage of the Late Jurassic by uranium–lead dating of zircons, providing an age of 147 ± 0.1 Ma.[1] It consists of an sequence of clastic sedimentary sandstones and conglomerates, interbedded with volcanic tuffs and ignimbrite.[2] The dinosaurs Chilesaurus and indeterminate diplodocids and the mesoeucrocodylian Burkesuchus are known from the formation.[3][4][5] The formation was deposited in a fluvio-deltaic environment.[6]

Paleobiota of the Toqui Formation

Crocodylomorphs

GenusSpeciesMaterialNotesImages
Burkesuchus B. mallingrandensis "Fragmented skull and partial postcrania."[5] A neosuchian.
Crocodylomorpha indet. Indeterminate "Partial postcrania."[7] A neosuchian.

Dinosaurs

GenusSpeciesMaterialNotesImages
Chilesaurus C. diegosuarezi "Skull with and skeletons from multiple specimens."[3][8] A dinosaur with uncertain affinities.
Diplodocidae indet. Indeterminate "Cervical centra."[4] A diplodocid.
Diplodocinae indet. Indeterminate "Partial caudal vertebra."[4] A diplodocin.

Sauropoda indet.

 Indeterminate "Partial dorsal vertebra."[4] A sauropod.
Indeterminate "Two caudal vertebrae centra."[4] A sauropod.
Indeterminate "Partial sternal plate."[4] A sauropod.

Titanosauriformes? indet.

 Indeterminate "Lower end of left femur."[4] A titanosauriform.
Indeterminate "Lower end of right tibia."[4] A titanosauriform.

See also

References

  1. ↑ Suárez, Manuel; De La Cruz, Rita; Fanning, Mark; Novas, Fernando; Salgado, Leonardo (2015-12-28). "Tithonian age of dinosaur fossils in central Patagonian, Chile: U–Pb SHRIMP geochronology". International Journal of Earth Sciences. 105 (8): 2273–2284. doi:10.1007/s00531-015-1287-7. ISSN 1437-3254.
  2. ↑ Salgado, Leonardo; Cruz, Rita Dela; Suárez, Manuel; Fernández, Marta; Gasparini, Zulma; Palma-Heldt, Sylvia; Fanning, Mark (2008-06-12). "First Late Jurassic dinosaur bones from Chile". Journal of Vertebrate Paleontology. 28 (2): 529–534. doi:10.1671/0272-4634(2008)28[529:fljdbf]2.0.co;2. hdl:1885/37839. ISSN 0272-4634.
  3. 1 2 Novas, Fernando E.; Salgado, Leonardo; Suárez, Manuel; Agnolín, Federico L.; Ezcurra, Martín D.; Chimento, Nicolás R.; de la Cruz, Rita; Isasi, Marcelo P.; Vargas, Alexander O. (2015). "An enigmatic plant-eating theropod from the Late Jurassic period of Chile". Nature. 522 (7556): 331–334. doi:10.1038/nature14307. ISSN 0028-0836. PMID 25915021.
  4. 1 2 3 4 5 6 7 8 Salgado, Leonardo; Novas, Fernando E.; Suarez, Manuel; Cruz, Rita De La; Isasi, Marcelo; Rubilar-Rogers, David; Vargas, Alexander (2015). "Late Jurassic Sauropods in Chilean Patagonia". Ameghiniana. 52 (4): 418–429. doi:10.5710/amgh.07.05.2015.2883. hdl:11336/39545. ISSN 0002-7014.
  5. 1 2 Novas FE, Agnolin FL, Lio GL, Rozadilla S, Suárez M, de la Cruz R, Carvalho IS, Rubilar-Rogers D, Isasi MP (2021). "New transitional fossil from late Jurassic of Chile sheds light on the origin of modern crocodiles". Scientific Reports. 11 (1): Article number 14960. doi:10.1038/s41598-021-93994-z. PMC 8298593. PMID 34294766.
  6. ↑ Toqui Formation, Aysén at Fossilworks.org
  7. ↑ Lio, G.; Novas, F.; Salgado, L.; Suárez, M.; De La Cruz, R. (2010). "First record of a non-marine crocodylomorph (Archosauria) from the Upper Jurassic of Chile". Ameghiniana. 48 (4).
  8. ↑ Chimento, N. R.; Agnolin, F. L.; Novas, F. E.; Ezcurra, M. D.; Salgado, L.; Isasi, M. P.; Suarez, M.; De La Cruz, R.; Rubilar-Rogers, D.; Vargas, A. (2017). "Forelimb posture in Chilesaurus diegosuarezi (Dinosauria, Theropoda) and its behavioral and phylogenetic implications" (PDF). Ameghiniana. 54 (5): 567−575. doi:10.5710/AMGH.11.06.2017.3088. hdl:2250/148932.


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