Toqui Formation
Geologic formation in the Aysén Region, Chile
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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]
| 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 | 46.6°S 72.4°W |
| Approximate paleocoordinates | 44.8°S 32.4°W |
| Region | Aysén Region |
| Country | Chile |
  Toqui Formation (Chile) | |
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. | ||
