Ancient Oceans: Season 1, Episode 1 - ProjectFreeTV

1 - 1: The Ordovician

For nearly 4 billion years, the continents of Earth were a lifeless wasteland. But beneath the sea, our planet was teeming with life. Many strange creatures evolved, from eel-like conodonts to voracious cephalopods, until nearly all life was wiped out in our planet's first mass extinction.