The Ordovician period, which lasted from about 485 to 444 million years ago, is a significant era in Earth's history, marked by a rich diversity of marine life and notable mass extinction events.

These first steps toward life on land were cut short by the freezing conditions that gripped the planet toward the end of the Ordovician. This resulted in the second largest mass extinction of all ...

although it’s unclear if whether that amounts to a sixth mass extinction. The Ordovician-Silurian mass extinction event may have wiped out some 85 percent of species, including many of the ...

Ordovician-Silurian Extinction (about 443 million years ago): Around 85% of species went extinct, likely due to a combination of a drop in sea levels and glaciation, followed by rising sea levels ...

1. Silurian survivors of the Late Ordovician mass extinction were mostly cold-adapted animals from high latitudes or deep waters. 3. Silurian brachiopods included pentamerids (teardrop-shaped shells) ...

Speciation and extinction are fundamental processes that ... Finally, a reevaluation of the Cambrian Explosion and the Great Ordovician Biodiversification Event has led to new insights into ...

But first there was a period of biological regrouping following the disastrous climax to the Ordovician ... drew to a close with a series of extinction events linked to climate change; however ...

Emma Bernard, a curator of fossil fish at the Museum, says, 'Shark-like scales from the Late Ordovician have been found ... is known as the 'golden age of sharks'. An extinction event at the end of ...

We find that the ozone depletion from UCMHs can be significant, and even of similar magnitude to the levels which have been linked to the cause of the Late-Ordovician mass extinction event. However, ...

Great Ordovician Biodiversification Event and the end- Ordovician extinction event. Harper is an outstanding taxonomist and systematist of the Brachiopoda and has published numerous papers on their ...