Toqui Formation, Geological formation in Aysén Region, Chile.
The Toqui Formation is a layered rock unit in the Aysén Region consisting of sandstone, conglomerate, volcanic tuff, and ignimbrite deposits. These strata reach a combined thickness of approximately 320 meters and form an important stratigraphic sequence for understanding southern Chilean geology.
The formation originated approximately 147 million years ago during the Jurassic period, as established through uranium-lead dating of zircon minerals. This age places the rock unit within the Tithonian stage of the Late Jurassic.
Scientists from various institutions conduct research at the formation to understand the geological evolution of southern Chile through time.
The main exposure of this rock unit is located near the El Toqui Mine in the Alto Manihuales area of the region. Access depends on conditions and permissions related to mining operations in the area.
The rock preserves fossils of the small dinosaur Chilesaurus and other sauropods, along with remains of an early crocodile called Burkesuchus. These finds are uncommon and help scientists understand what animals inhabited this remote region during Jurassic times.
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