Dear Kitty. Some blog

This November 2017 video says about itself:

Climatic cooling during the Ordovician caused explosion of marine diversity

Read more here.

From Ohio University in the USA:

Early species developed much faster than previously thought

Landmark review of Great Ordovician Biodiversification Event

When Earth’s species were rapidly diversifying nearly 500 million years ago, that evolution was driven by complex factors including global cooling, more oxygen in the atmosphere, and more nutrients in the oceans. But it took a combination of many global environmental and tectonic changes occurring simultaneously and combining like building blocks to produce rapid diversification into new species, according to a new study by Dr. Alycia Stigall, Professor of Geological Sciences at Ohio University.

She and fellow researchers have narrowed in a specific time during an era known as the Ordovician Radiation, showing that new species actually developed rapidly during a much shorter time frame than previously thought…

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