Chorillo Formation, Geological formation in Santa Cruz, Argentina
The Chorillo Formation is a geological layer in southern Patagonia made up of claystone that sits between two other rock formations. The deposit spans several dozen meters thick and preserves fossils from the Late Cretaceous period.
Researchers first documented this rock layer as a distinct formation in 1984 and recognized its potential for paleontological study. Since then, numerous excavations have recovered important dinosaur remains from this period.
The formation serves as a research center where scientists conduct extensive studies on prehistoric life forms, including theropods, ornithopods, and ancient mammals.
The site is located in a remote area of Santa Cruz province, which requires planning with proper preparation. Access is limited and typically only possible through organized scientific expeditions.
The layers have yielded fossils of rare dinosaurs including Isasicursor, a small herbivore, and Kookne, an early feathered predator. These finds help scientists understand the diversity of dinosaurs at the end of the Cretaceous period better.
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