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 ~ | |
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) |
Genus | Species | Material | Notes | Images |
---|---|---|---|---|
Burkesuchus | B. mallingrandensis | "Fragmented skull and partial postcrania."[5] | A neosuchian. | |
Crocodylomorpha indet. | Indeterminate | "Partial postcrania."[7] | A neosuchian. |
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. |