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. It consists of an sequence of clastic sedimentary sandstones and conglomerates, interbedded with volcanic tuffs and ignimbrite. The dinosaurs Chilesaurus and indeterminate diplodocids and the mesoeucrocodylian Burkesuchus are known from the formation. The formation was deposited in a fluvio-deltaic environment. Paleobiota of the Toqui Formation Crocodylomorphs Dinosaurs See also Geology of Chile Tobífera Formation References External links Geologic formations of Chile Jurassic paleontological sites Mesozoic paleontological sites of South America Fossiliferous stratigraphic units of South America Jurassic System of South America Late Jurassic South America Jurassic Chile Tithonian Stage Conglomerate formations Sandstone formations Tuff formations Deltaic deposits Fluvial deposits Formations Paleontology in Chile Geology of Aysén Region