3 min read The Cambrian period, part of the Paleozoic era, produced the most intense burst of evolution ever known. The Cambrian Explosion saw an incredible diversity of life emerge, including ...

Comprehending the dynamics of pyrite burial and atmospheric oxygen accumulation during the early Paleozoic could shed ...

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