As alien as these creatures seem, they are also surprisingly ... It has long been suspected that the sparseness of the pre-Cambrian fossil record reflects these two problems.

High in Canada’s Rocky Mountains, the animals of an ancient ecosystem can be seen battling for life. The fossils of the Burgess Shale offer a glimpse at the incredible diversity of early life on ...

The earliest known primitive chordate is Pikaia gracilens, a wormlike creature that swam in middle Cambrian seas. Fossils found in the Burgess Shale of British Columbia show traces of a notochord ...

It's Pre-Cambrian - it's of an age that we now call ... to advanced segmentation," said Prof Xiao. In the past, the creatures that lived in the Ediacaran had been extremely difficult to classify.

This creature could have evolved as part of the Cambrian explosion that occurred during the Paleozoic era about 530 million years ago. The era saw a large increase in the amount of habitable space ...

Imagine traveling back in time to Earth roughly 500 million years ago, right in the middle of the Cambrian Explosion ... a vast array of the most unusual creatures imaginable.