From Face 2 Face website:
The time is 250 million years ago, the place is the super-continent Pangaea. A devastated Earth has just undergone its greatest extinction and now Pangaea itself is splitting up. But this is not the end, it is a new beginning. As time passes the continents take shape. Forest, Savannah, mountains and wetlands appear. Animals evolve, and strong species compete for their territories. As life battles life, the question “Who will rule the earth?” remains unanswered.
In Genesis you play the part of great reptiles, dangerous dinosaurs, powerful mammals or cunning man establishing yourself in the new ecosystems on the barren earth as you strive for world dominance.