Round Two of Life on Earth

Three-dimensional reconstruction of a Devonian amphibian Ichthyostega
Reconstruction of a Devonian amphibian Ichthyostega.

After that first ice age, life started to rebound. What is now Europe and North America were combined, and both were at or near the equator.

By about 400 million years ago, amphibians were beginning to make their way onto land.

  • In water, many types of fishes could be found.
  • The first types of fish did not have a jaw.
  • Later, jawed fish became more common. 
  • This was also a time when the first sharks could be found.

Another mass extinction caused many types of sea life to disappear around 354 million years ago.