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 ...

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 ...

A rare and stunning discovery in New York State has unveiled a 450-million-year-old fossil that provides valuable insights ...

Rich brachiopod fossils dating back 470 million years to the Ordovician period were discovered in Zigui county, Central China's Hubei Province. Experts suggest these fossils provide evidence for ...