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The Dinosaurs of North America Were Thriving Up Until an Asteroid Wiped Them Off the Face of the Earth, Scientists Argue

Summary by Smithsonian Mag
A new study of dinosaur biodiversity challenges the belief that the megafauna were on their way out 66 million years ago

4 Articles

Dinosaurs showed no signs of decline before the impact of the asteroid that caused its extinction.This was revealed by a new study published on Thursday, October 23 in Science magazine. Research led by the State University of New Mexico and the University of Edinburgh analyzed rock formations from the Naashoibito Member site, located in the state of New Mexico, United States.This site preserves some of the latest fossil records of non-avian dino…

New research challenges the conventional wisdom that dinosaurs flourished before the asteroid impact 66 million years ago. Fossil evidence shows that dinosaur populations across North America increased, thriving in regional communities. The study finds that their distribution was primarily influenced by temperature fluctuations, not geographic barriers. This ecosystem laid the foundation for the diversification of mammals.

A set of f six discovered in the lands of New M xico represents a group of dinosaurs who lived in Am rich in the North. The discovery, the subject of a study published in Science magazine on Friday (23), has the potential to resolve a long paleontol gica dispute. Read more (10/27/2025

·São Paulo, Brazil
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Folha de S.Paulo broke the news in São Paulo, Brazil on Monday, October 27, 2025.
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