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Ordovician Radiation: Craziest Time for Early Life? Annalee Newitz, Ars Technica November 21, 2017. Fritz Geller-Grimm. Over half a billion years ago, during the Cambrian geological period, life on ...

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. The ...

Animals had arrived on the scene and life on Earth never looked back. At least, that's what we originally thought the fossil record … JUST over half a billion years ago, evolution hit a ...

The Late Ordovician period, ending 444 million years ago, was marked by the onset of glaciations. The expansion of non-vascular land plants accelerated chemical weathering and may have drawn down ...

The series of extinctions that occurred during the Ordovician and Silurian periods between 445 and 415 million years ago wiped out as much as 85 percent of all animal species on Earth.