Paleontologists have debated the age of fossils found at the Naashoibito site in northwestern New Mexico. The new study used two dating methods to determine that the fossils date

New dating has revealed that New Mexico's last dinosaurs were healthy, diverse and thriving at the end of the Cretaceous period, suggesting non-avian dinosaurs weren't in decline before being snuffed out by the asteroid strike.

Dinosaurs appear to have been thriving before a giant asteroid hit the Earth 66 million years ago, paleontologists working in New Mexico said Thursday in the journal Science. Experts have long debated whether the asteroid was the final blow to a dinosaur population already in decline or if it cut short a flourishing reptilian dynasty.

Scientists have long debated whether dinosaurs were in decline before an asteroid smacked the Earth 66 million years ago, causing mass extinction. New research suggests dinosaur populations were still thriving in North America before the asteroid strike,

Scientists have long debated whether dinosaurs were in decline before an asteroid smacked the Earth 66 million years ago, causing mass extinction.