600 mya to 200 Mya (Mya means million years ago)
600 Mya: A burst of evolutionary creativity simultaneously gave rise to the basic body plans of all multicellular (animals?)
550 Mya to 490 Mya: is about the measure of the Cambrian Period. The Cambrian Period includes the following Epochs: Furongian, Miaoligian, Series 2, Terreneuvian,
251.9 Mya to 201.3 Mya, Triassic Period: The fires geological period of the Mesozoic Era. The Triassic period is between the Permian and Jurassic periods. First evidence of mammals, a mouse size critter, found to lie within the Triassic period. this geologic period ended with a mass extinction of species.
200 Mya to 145 Mya, Jurassic period: The Jurassic lies between the Triassic and Cretaceous periods. The super-continent, Pangaea began to drift apart during this time There was lots of life, wet climate, and lush vegetation. Many new dinosaurs appeared. There was a "minor" mas extinction toward the end of the Jurassic period. Conifers appeared. Mammals were common, but small. There is evidence of first birds and lizards.