| Toqui Formation | |
|---|---|
| Stratigraphic range: Tithonian ~ | |
 Cast of Chilesaurus from the Toqui Formation | |
| Type | Geological formation |
| Unit of | Coihaique Group |
| Underlies | Katterfeld Formation |
| Overlies | Ibáñez Formation |
| Thickness | 300–320 m (980–1,050 ft) |
| Lithology | |
| Primary | Conglomerate, sandstone, tuffite, ignimbrite |
| Location | |
| Coordinates | 46°36′S 72°24′W / 46.6°S 72.4°W / -46.6; -72.4 |
| Approximate paleocoordinates | 44°48′S 32°24′W / 44.8°S 32.4°W / -44.8; -32.4 |
| Region | Aysén Region |
| Country | Chile |
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.345 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."38 | 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. |
References
References
- 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.
- 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.
- 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.
- 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.
- 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.
- Toqui Formation, Aysén at Fossilworks.org
- 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).
- 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.