Much of the landmass that would become western North America was under a shallow ocean for much of the Silurian Period. These shallow waters enabled sunlight to penetrate, and marine animals ...

The Paleozoic era's Silurian period saw animals and plants finally emerge on land. But first there was a period of biological regrouping following the disastrous climax to the Ordovician.

Ancient Milwaukee was home to coral reefs and trilobites The Cambrian period was followed by the Ordovician period (485 to 443 million years ago) and the Silurian ... it's all the animals living ...

The diversity of jawed-fish remains from the Devonian period (419 million ... now have a healthy Silurian record; the oldest complete examples of these animals date to even older deposits of ...

The earliest animals with backbones, the vertebrates, were around in the Cambrian, but they did not diversify extensively until the Silurian period, just over 420 million years ago. The oceans ...

Arthropods are a group of invertebrate animals that include insects ... from the Cambrian Period through to the Silurian Period. But the giant insects really got going during the Devonian Period ...

Life on earth reached a milestone during the Devonian period, 420 to 360 million years ago. For the first time, it became visible from space. In the Silurian period that preceded the Devonian, most ...