Toqui Formation

Toqui Formation
Stratigraphic range: Tithonian
~147 Ma
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
CountryChile
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 ages between 148.7 ± 1.4 Ma and 147 ± 1.0 Ma.[1] It consists of a 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

Genus Species Material Notes Images
Burkesuchus B. mallingrandensis "Fragmented skull and partial postcrania."[5] A neosuchian.
Crocodylomorpha indet. Indeterminate "Partial postcrania."[7] A neosuchian.

Dinosaurs

Genus Species Material Notes Images
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. hdl:11336/57592. 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. ^ a b 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. Bibcode:2015Natur.522..331N. doi:10.1038/nature14307. ISSN 0028-0836. PMID 25915021.
  4. ^ a b c d e f g h 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. ^ a b 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) 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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