The Age of Animals, 400 MYA - 250 MYA

Before the dinosaurs, (if the logic of evolution is to be believed), the animals were less evolved. Scientists posit that the first aquadic life to come to land were those that had developed legs like spiders, scorpions, and primitive insects. What a golden age these first pioneers must have experienced! Continent after continent filled with plants that had millions of years to establish themselves, lay before them. The atmosphere was far more oxygen rich than later. Good times! But then came others from the sea, looking for meat.

The superior species seemed to be the reptile, with mammals living on the edges of life. In fact, the reptile's greatest age was next.

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MYA = Million Years Ago
BYA = Billion Years Ago

Here's the rest of the great ages of history.