Scientists have discovered levels of iridium 30 times greater than average in the Cretaceous/Tertiary (KT) boundary, the layer of sedimentary rock laid down at the time of the dinosaur extinction.

An asteroid strike 66 million years ago caused millions of species to go extinct—including many mollusks. By studying the ...

The extraterrestrial object that slammed into our planet spelled doom for dinosaurs and countless ... which prompted the so-called KT extinction event, signifying the end of the Cretaceous period ...

Heaman and his colleagues believe if their new uranium-lead dating technique bears out on more fossil samples then the KT extinction paradigm and the end of the dinosaurs will have to be revised.

A fossil from British Columbia, originally discovered in the 80s, has finally been identified as a new species named ...

A Triceratops may have been the last dinosaur standing, according to a new study that determined a fossil from Montana's Hell Creek Formation is "the youngest dinosaur known to science." The ...

A team of scientists has discovered the youngest dinosaur preserved in the fossil ... They found the fossil buried just five inches below the K-T boundary, the geological layer that marks the ...

including the non-avian dinosaurs, in an event known as the K-T mass extinction. (Extensive volcanism in the Deccan Traps region of Western India and long-term climate change likely contributed to ...

The mass extinction that wiped out the dinosaurs paved the way for a totally ... occurred right at the KT boundary (the boundary between the Cretaceous and the Paleogene periods), soon after ...

The K-T extinction ended the dinosaurs' reign on Earth and caused the extinction of 70 percent of life on the planet at the time. The asteroid-impact theory was controversial when first posited in ...

So, how did avian dinosaurs survive when all others died? Avian Dinosaurs Before the KT Extinction Event Pterodactyls and other pterosaurs are not avian dinosaurs. They were flying reptiles that ...

Sixty-five million years ago, an asteroid killed the dinosaurs. Not that the ruling ... for the past 66 million years, so the K/T boundary, with the “K” from the German term for Cretaceous ...