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  • The Los Colorados Formation is a sedimentary rock formation found in La Rioja, Argentina. It has a Norian age, and is notable for its fossils of early dinosaurs, including the coelophysoid Zupaysaurus and the "prosauropods" Coloradisaurus, Lessemsaurus, and Riojasaurus. Magnetostratigraphic analysis suggests that the Los Colorados Formation was deposited between 227 and 213 million years ago. Wikipedia

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