Toqui_Formation
Toqui Formation
Geologic formation in the Aysén Region, 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 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]