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Dinosaurs thrived across North America just before the asteroid impact, new fossil evidence shows.
A newly studied site in New Mexico’s San Juan Basin, dated to about 66 million years ago, reveals diverse dinosaur fossils—including the massive Alamosaurus—indicating thriving dinosaur populations just before the asteroid impact.
Using magnetic field data and radiometric dating, scientists confirmed the site’s age aligns with the Hell Creek Formation, challenging long-held theories of a pre-extinction decline.
The findings, published in Science, suggest dinosaurs were ecologically healthy and widespread across North America, with the asteroid strike likely causing their sudden extinction rather than prolonged environmental stress.
Los dinosaurios prosperaron en toda América del Norte justo antes del impacto del asteroide, según muestran nuevas evidencias fósiles.