Life at the start of the Ordovician remained confined to the seas with new animals evolving in place of those that didn't survive the Cambrian. Chief among them were the squidlike nautiloids ...

International scientists have uncovered the oldest known phosphatic stromatoporoid sponge, dating back approximately 480 ...

That's right, prehistoric marine worms could have made a significant contribution to the Great Ordovician Biodiversifiaction Event. "It's really incredible to think how such small animals ...

International scientists have uncovered the oldest known phosphatic stromatoporoid sponge, dating back approximately 480 million years to the Early ...

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.