Toqui Formation

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
CountryChile
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]

Fossil content

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Sauropods

Sauropods of the Toqui Formation
Genus Species Location Stratigraphic position Material Notes Image
Diplodocidae indet. Indeterminate Aysén Tithonian Cervical centra. A diplodocid sauropod
Diplodocinae indet. Indeterminate Aysén Tithonian Partial caudal vertebra. A diplodocine diplodocid
Sauropoda indet. Indeterminate Aysén Tithonian Partial dorsal vertebra. A indeterminate sauropod
Indeterminate Aysén Tithonian Two caudal vertebrae centra. A indeterminate sauropod
Indeterminate Aysén Tithonian Partial sternal plate. A indeterminate sauropod
Titanosauriformes Indet. Indeterminate Aysén Tithonian Lower end of left femur. A titanosauriform sauropod
Indeterminate Aysén Tithonian Lower end of right tibia. A titanosauriform sauropod

Theropod

Theropods of the Toqui Formation
Genus Species Location Stratigraphic position Material Notes Image
Chilesaurus C. diegosuarezi Aysén Tithonian Skull with and skeletons from multiple specimens. tetanuran theropod

Crocodylomorphs

Crocdylomorps of the Toqui Formation
Genus Species Location Stratigraphic position Material Notes Image
Burkesuchus B. mallingrandensis Aysén Tithonian Fragmented skull and partial postcrania. A neosuchian
Crocodylomorpha Indet. Indeterminate Aysén Tithonian Partial postcrania.
Purranisaurus P. potens Aysén Tithonian A geosaurin geosaurine

Fish

Fishes of the Toqui Formation
Genus Species Location Stratigraphic position Material Notes Image
Leedsichthys L. problematicus Aysén Tithonian A giant pachycormid pachycorminform

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. ^ 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. ^ 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. ^ 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
  • Media related to Toqui Formation at Wikimedia Commons


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