Mesozoic Era: 251–65 Million Years Ago (A) shows dinosaurs such as the Brachiosaurus roaming the Earth. The landscape was very lush with plenty of vegetation and plant life to provide nourishment to the dinosaurs. The Cenozoic Era- 65 Million Years ago to Present- (B) shows different animals around a shallow watering hole. There are birds, antelope and other mammals, showing how the diversity increased during the Cenozoic Era.