More than 17,000 species are known to have survived until the mega-extinction that ended the Permian period 251 million years ago. A predator of the Cambrian was the giant, shrimplike Anomalocaris ...

Others propose that an extinction ... opportunity for the Cambrian explosion to occur. Internal, genetic factors were also crucial. Recent research suggests that the period prior to the Cambrian ...

Most people think of crocodilians as living fossils—stubbornly unchanged, prehistoric relics that have ruled the world's ...

a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land—before the second largest mass extinction of all time ended the period.

Here, we will explore what the Earth was like at this time, the plants and animals that existed, and the extinction events that they endured. The Jurassic Period can be subdivided into three epochs.

from the Cambrian Period of the Burgess Shale of Canada. They photographed the specimens, both wet and dry, using a polarizing filter that can better reveal subtle features and extinction phases ...

Others propose that an extinction ... opportunity for the Cambrian explosion to occur. Internal, genetic factors were also crucial. Recent research suggests that the period prior to the Cambrian ...