Precambrian time covers the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms ...

Its Precambrian sandstone beds, once an ancient seafloor, are rich with fossils that capture life from over half a billion years ago. The remarkable preservation of these fossils owes much to the ...

Even organisms that hadn't evolved hard parts, and thus didn't leave fossils of their bodies, left fossils of the trails they made as they moved through the Precambrian mud. Life was flourishing ...