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Where to watch "Ancient Oceans"
![](https://image.tmdb.org/t/p/w1280/uHJsT9ZJsDEGgX8VObHMzhXWkWp.jpg)
2. The Devonian
No release date yet
Life in the sea rebounded with a vengeance in the Devonian. Dozens of monstrous predators emerged, like the 40-foot long Dunkleosteus. Nearly everything was wiped out in Earth’s second mass extinction. But the stage was set for an explosion of life on land.
![](https://image.tmdb.org/t/p/w1280/qgqkPyeoXmzdPDGkLOONsSArue2.jpg)
1. The Ordovician
No release date yet
For nearly 4 billion years, the continents of Earth were lifeless. But during the Ordovician, there was an explosion of life beneath the sea. 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.