Toqui Formation

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 are known from the formation.[3][4] The formation was deposited in a fluvio-deltaic environment.[5]

Toqui Formation Stratigraphic range: Tithonian ~147 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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	46.6°S 72.4°W / -46.6; -72.4
Approximate paleocoordinates	44.8°S 32.4°W / -44.8; -32.4
Region	Aysén Region
Country	Chile
Toqui Formation (Chile)

See also

• Geology of Chile
• Tobífera Formation

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. 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. (2015-04-27). "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. Salgado, Leonardo; Novas, Fernando E.; Suarez, Manuel; Cruz, Rita De La; Isasi, Marcelo; Rubilar-Rogers, David; Vargas, Alexander (August 2015). "Late Jurassic Sauropods in Chilean Patagonia". Ameghiniana. 52 (4): 418–429. doi:10.5710/amgh.07.05.2015.2883. ISSN 0002-7014.
5. Toqui Formation, Aysén at Fossilworks.org