Quiriquina Formation, Geological formation in Biobío Region, Chile.
The Quiriquina Formation is a geological sequence in the Biobío Region made up of sandstone and conglomerate layers. These rock formations stretch across central areas of Chile near the Pacific coast.
The formation was first scientifically documented in 1982 and has since become a key site for understanding Late Cretaceous marine environments in South America. The layers preserve evidence of these ancient ocean conditions.
The formation serves as an educational resource for geology students and researchers who study the evolution of marine ecosystems in Chile.
The formation is accessible in the Biobío Region through established access routes where fieldwork and sample collection can take place. Visitors should prepare for uneven terrain and bring suitable equipment for exploring the site.
The rock layers contain fossils of extinct marine creatures such as Aristonectes quiriquinensis and Australobaena chilensis from the Late Cretaceous. These animal remains offer insight into life in ancient South American oceans.
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