The Jurassic Period
When was it?
208 to 144 million years ago.
What was going on?
Dinosaurs make it big.
What were the continents like?
It's still just Pangaea for most of the period, but the continents begin to separate
and begin to form the Atlantic ocean.
What kind of life existed?
Dinosaurs fill tons of niches -- land, air (pterosaurs), and sea (icthyosaurs, among others).