Study Reveals Dinosaurs Thrived in North America Pre-Asteroid Extinction
New research reveals that dinosaurs were thriving in North America shortly before the asteroid impact that led to their mass extinction 66 million years ago. This study challenges the long-held belief that these creatures were in decline prior to their abrupt disappearance. The findings may shift perspectives on the final days of dinosaurs.
Key Findings of the Study
The research focuses on the Kirtland Formation in northern New Mexico, a site well-known for its dinosaur fossils. It has been suggested that the fossils and accompanying rock layers date back approximately 400,000 years before the asteroid struck Earth. This time frame is relatively short in geological terms.
Methods of Analysis
- Researchers analyzed volcanic glass particles within sandstone.
- Magnetic minerals in mudstone were studied to establish dating.
These methods indicate that the dinosaurs found in this area lived close to the end of the Cretaceous period, as explained by Daniel Peppe, a paleontologist from Baylor University and co-author of the study.
Variety of Dinosaur Species
The fossils discovered in New Mexico include notable species such as Tyrannosaurus rex and a horned herbivore resembling Triceratops. Differences observed between these fossils and those found in Montana, previously thought to be dated to the same period, suggest that dinosaurs may not have been on the verge of extinction.
Expert Opinions
Experts not involved in the study, like Mike Benton from the University of Bristol, highlight the excitement surrounding this discovery. However, they caution that focusing on a single site may not reflect the entire diversity of dinosaur populations globally at that time.
Challenges in Dinosaur Dating
Accurately dating dinosaur fossils remains a challenge. According to Andrew Flynn, another co-author of the study, easily datable materials like carbon do not survive in fossils. Instead, researchers must identify surrounding rocks that exhibit specific characteristics suitable for dating.
Future Research Directions
Further research will be crucial to develop a comprehensive understanding of the range of dinosaur species alive globally just before the asteroid impact. This study is a vital piece in the ongoing investigation into the existence and extinction of dinosaurs.
