Paleontologist

Period: Triassic
There are 220 Million Years
Climate: Dry and Arid

During the Triassic, the super-continent called Pangea experienced its maximum size. The continental plates, come together to form a single total landmass that stretches from pole to pole: Pangea. The rest of the globe was covered by the vast ocean Panthalassa (twice larger than the current Pacific). If the sea sometimes isolated parts of Pangea, the similarities in the world of fauna and flora show that living beings could move anywhere on its surface. The North and South arm had known periods of seasonal abundance, because it stop rain brought by the winds, depriving the heart of the continent precipitation and contributes to the formation of large deserts.

Period: Jurassic
There are about 150 Million Years
Climate: Hot and Humid

For most of the Jurassic, the giant continent of Pangea stretched from one piece of a pole to pole. Towards the end of this period, large cracks began to divide.
North America began a rotation to the northwest and away from Africa.
Pangea began to fragment into two large continental masses: Laurasia in the north and Gondwana.

Period: CretaceousThere are 127 to 65 Million Years
Climate: Wet

During the Cretaceous, the continents are deployed. The broad masses have continued to be divided under the effects of movements of the earth's mantle, weakening the crust and creating a ridge of volcanic between Europe and North America, Africa and South America and around the tip of southern Africa. Over millions of years, this movement opened the Atlantic Ocean, the Antarctic island and brought northern India with Asia.
Ocean levels rose and shared America in two (Thetys separate from the North and South). 
With this division that fauna and flora of the two hemispheres are slightly different.

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