New research suggests that dinosaur populations were thriving in North America before the asteroid impact 66 million years ago that caused mass extinction.

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.

A trove of specimens from New Mexico may help settle a long-running argument about the diversity of dinosaurs before their extinction.

Newly dated fossils from New Mexico challenge the idea that dinosaurs were in decline—and suggest instead they had formed flourishing communities.

A groundbreaking discovery in Arizona has revealed the oldest known pterosaur species ever found in North America. The new species, Eotephradactylus mcintireae, lived around 209 million years ago, a time when dinosaurs were just beginning to dominate the Earth.

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