La Amarga Formation, Geological formation in Río Negro Province, Argentina
La Amarga Formation is a geological layer in Río Negro Province that spans across three Argentine provinces with varying rock units. Each layer reveals different ancient environments through its mineral composition and preserved remains.
This layer dates from the Early Cretaceous period, roughly 130 to 120 million years ago, and represents some of the oldest land deposits in the Neuquén Basin. It formed during a time of significant environmental shifts as continental conditions continuously changed.
Scientists from multiple nations conduct research at La Amarga Formation to understand the evolution of dinosaurs and early mammals in South America.
The site is located at several geographic points, with La Amarga Arroyo and China Muerta Hill being particularly notable reference locations. Access to these areas may require a guide or local knowledge, as the sites are situated in fairly remote regions.
The oldest of these layers has preserved fossils of animals now extinct, including the long-necked dinosaur Amargasaurus. These discoveries help researchers understand how early dinosaurs evolved across South America.
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