Timeline of Environmental History - 250 000 000 Ya

250 000 000 Ya

220 Ma

• Evo : Mammalia : Mammals
• Evo : Theriiformes : Mammals that birth live young (i.e. non-egg-laying)

150 Ma

• Evo : Birds

130 Ma

• Evo : Flowers

125 Ma

• Evo : Eutheria : Placental mammals (i.e. non-marsupials)
• Evo : Boreoeutheria : Supraprimates, bats, whales, most hoofed mammals, and most carnivorous mammals

100 Ma

• Evo : Euarchontoglires : Supraprimates (primates, rodents, rabbits, treeshrews, and colugos)