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 ...

Paleontologists have discovered remarkable fossils in the Grand Canyon that reveal fresh details about the emergence of complex life half a billion years ago. The newfound remains of fauna from the ...

What does it take for soft-bodied animals, built to rot not to rock, to persist for 500 million years in the Grand Canyon? The usual answer in paleontology is simple: take away oxygen, slow decay, and ...

Rocks gathered along the Colorado River contained evidence of a bustling community of animals in an ancient sea. Scientists recovered dozens of fist-size Cambrian rocks estimated between 502 million ...

Animal life seemed to explode into a wide variety of new forms in the Cambrian period. Sun et al. (2002). National Science Review. via Wikipedia under CC By 4.0 Sometime before 520 million years ago, ...