The Silurian Period
When was it?
438 to 408 million years ago.
What was going on?
Bugs and Fish; plants begin to colonize the land.
What were the continents like?
Godwanaland still occupies the area near the south pole, but several other (smaller)
continents were near the equator.
What kind of life existed?
With the disappearance of the trilobytes, some more advanced large arthropods appear.
Also, the first jawed fishes appear. And plants begin to colonize the land.