3 min read During the Ordovician period, part of the Paleozoic era ... animals evolving in place of those that didn't survive the Cambrian. Chief among them were the squidlike nautiloids, a ...

The Ordovician period, which lasted from about 485 to 444 ... This challenges the notion of abrupt events like the Cambrian Explosion and emphasizes the need for a more nuanced understanding ...

Arthropods were the most diverse animal group in the Cambrian period and the Ordovician period that followed. The 452-million-year-old limestone slab shown here captures an Ordovician menagerie ...

Eric Monceret and Sylvie Monceret-Goujon found one of the world’s richest and most biodiverse fossil sites from the Lower Ordovician period ... While the Cambrian explosion 70 million years ...