In the red-brown siltstones of Yunnan province, southwest China, paleontologists have found something that was not supposed ...

The assemblage suggests that the ancestors of some of today's animal groups may have arisen before the famed Cambrian explosion ...

Around 540 million years ago, the ocean erupted with complex life: Creatures rapidly transformed from simple, soft-bodied, ocean-floor-dwelling animals into bodies we might recognize today—animals ...