The fossils date back to the Cambrian Explosion around half a billion years ago when animal life was evolving in new ways. Within the walls of the Grand Canyon, researchers have discovered thousands ...

A team of scientists digging up some of the Earth’s oldest rocks has uncovered new chemical evidence that Earth’s first ...

Sometime before 520 million years ago, animal life began to flourish as never before. The small shells, worms and even sponge-like enigmas of earlier eras suddenly unfolded into a new array of species ...

MIT geochemists offer compelling evidence that ancient sea sponges were Earth's first animals, emerging over 541 million ...