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The Cretaceous–Paleogene (K–Pg) extinction event, [a] also known as the K–T extinction, [b] was the mass extinction of three-quarters of the plant and animal species on Earth [2] [3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.
Luis Walter Alvarez, left, and his son Walter, right, at the K–T Boundary in Gubbio, Italy, 1981. The Alvarez hypothesis posits that the mass extinction of the non-avian dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth.
The study, published in Proceedings of the National Academy of Sciences, finds that some dinosaur eggs may have taken six months or more to hatch–much longer than the eggs of dinosaurs' close ...
He also discusses why the dinosaurs died out while other animals did not, the history of our understanding of the causes of dinosaur extinction, and competing theories. The epilogue covers the rise of mammals after the dinosaur extinction, the subject of Brusatte's next book The Rise and Reign of the Mammals .
In a new report published by Nature Geoscience, researchers believe that, while these other impacts would have critically harmed hundreds of dinosaur species, past studies had neglected the role ...
A mass extinction event that brought about the rise of the dinosaurs more than 200 million years ago was believed to be caused by the planet’s warming. Now, scientists at Columbia University say ...
Dimetrodon is often mistakenly called a dinosaur or considered to be a contemporary of dinosaurs in popular culture, but it became extinct some 40 million years before the first appearance of dinosaurs. Being a synapsid, Dimetrodon is actually more closely related to mammals than to dinosaurs, birds, lizards, or other diapsids. [158] [159]
A study reveals the chemical makeup of the Chicxulub asteroid that collided with Earth and resulted in the extinction of nearly all dinosaurs 66 million years ago. Dinosaur-killing asteroid was ...