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 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]
| 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 |
| Approximate paleocoordinates | 44°48′S 32°24′W / 44.8°S 32.4°W |
| Region | Aysén Region |
| Country |  Chile |
  Toqui Formation (Chile) | |
Paleobiota of the Toqui Formation edit
Crocodylomorphs edit
| 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 edit
| 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 edit
References edit
- ^ 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.
- ^ 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.
- ^ 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. doi:10.1038/nature14307. ISSN 0028-0836. PMID 25915021.
- ^ 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.
- ^ 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): Article number 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.
External links edit
Media related to Toqui Formation at Wikimedia Commons
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