The Great Dyings - Season 1 Episode 1 The Chilling Tale of the Ordovician-Silurian Mass Extinction FIVE TIMES DURING COMPLEX LIFE'S HALF A BILLION YEAR REIGN, THE FORCES OF NATURE HAVE CONSPIRED AGAINST IT
Overview: 445 million years ago, the first mass extinction froze and suffocated the inhabitants of the Ordovician globe.