The Cretaceous is a geological period that began 145 million years ago and ended 66 million years ago. It is the last period in the Mesozoic Era. It comes after the Jurassic Period and before the ...

During this period, oceans formed as land shifted ... and skies would never be the same in the new era that dawned after the close of the Mesozoic era.

The Mesozoic Era extinctions formed the world as we know it today. Read about what caused them and which animals survived.

An ancient marine reptile was pregnant with twins when she died, according to fossilized remains of an ichthyosaur from the [ ...

The Jurassic Period is one of the three prehistoric geological periods of the Mesozoic Era. It spans from 145 million to 201 ...

Scientists divide the Mesozoic Era into three periods ... Sea levels rose and fell repeatedly during the Cretaceous Period. At the highest point there were many shallow seas separating parts of the ...

Those years are known as the Cretaceous period, the longest portion of the Mesozoic era, which ended approximately 66 million years ago (after a meteor strike, many scientists believe, eliminated ...

This is a reconstruction of the prehistoric mammal Spinolestes in the Cretaceous-period Las Hoyas wetland. This image is not associated with the current study but demonstrates a dark-furred mammal ...

Dinosaurs have captured people’s imagination ever since their bones and teeth were first scientifically described in 1822 by ...

A roughly 99-million-year-old piece of amber from northern Myanmar contains the skull of what appears to represent the smallest known dinosaur of the Mesozoic era. Carbon cycle modeling and ...