3 min read Continents were on the move in the Cretaceous, busy remodeling the ... and ammonites—perished in the extinction event at the end of the period 65 million years ago.

Several factors contributed to the survival of crocodiles, turtles, lizards and birds 66 million years ago, say our readers ...

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.

The five peaks show the "Big Five" mass extinction events, when extinction rates ... the end of the Triassic, and the Cretaceous/Tertiary (K/T) boundary. The fossil record, however, describes ...

Sixty-six million years ago, at the end of the Cretaceous Period, an asteroid impact near the Yucatán Peninsula of Mexico ...

That individual animal lived not so long before the Cretaceous-Tertiary extinction that wiped out many of Earth's species some 65 million years ago. Brachychampsa had short teeth and a large mouth ...

A doomsday scenario? NASA is tracking an asteroid that has a non-zero chance of striking Earth. We have some time to prepare, ...

Earth’s long history has seen an uncountable number of species come and go – but one of the most famous extinction events ... Cretaceous-Paleogene (K-Pg) boundary, formerly the Cretaceous ...

Sixty-six million years ago, at the end of the Cretaceous ... extinction of all known non-bird dinosaurs. But for the early ancestors of today's waterfowl, surviving that mass extinction event ...