Number of years ago:
CENOZOIC	Holocene	To 11000
	Pleistocene	To 1.8 million	Modern man	Ice Ages.
	Pliocene	To 5.3 million	Mammals with a placenta.	Ice at the poles, & Ice Ages.
	Miocene	To 23.8 million	Marsupials & anthropoid (human-like) apes.	The African-Arabian plate joined to Asia. Antarctica becomes separated.
	Ollgocene	To 33.7 million	Different species of cats, dogs & monkeys.
	Eocene	To 54.8 million	Small, horse-like animals, tapirs, rhinoceroses, ruminants, whales, & early elephants.
	Palaeocene	To 65 million
K-T boundary
MESOZOIC	Cretaceous	To 144 million	Angiosperms (flowering plants).	One world continent: 'Pangaea' continues to break up.
	Jurassic	To 206 million	Giant dinosaurs & primitive birds. Modern reef-building corals.	Pangaea starts to break up.
	Triassic	To 248 million	Dinosaurs, turtles & mammals.
PALEOZOIC	Permian	To 290 million	Reptiles	One world continent: 'Pangaea'.
	Carboniferous	To 354 million	Corals, crinoids, brachiopods & molluscs. Land vertebrates & winged insects.	Europe & N. America collided with Africa & S. America. Siberia collided with E. Europe.
	Devonian	To 417 million	Jawed armoured fish, early sharks, & bony fish, wingless insects, blastoids, ammonites & amphibians.	Three major continents, (a lot under water): 1) Siberia. 2)  N. America & Europe. 3) S. America, Africa, Antarctica, India & Australia.
	Silurian	To 443 million	Simple land plants. Sea scorpions, reef corals, cephalopods, & jawed fish.
	Ordovician	To 490 million	Nautiloides, corals, crinoids, bryozoans, & pelecypods. Armoured jawless fish. Primitive vascular plants.	North of the Tropics mostly ocean. Most of the land together in the southern super continent 'Gondwana' & most of it under water.
	Cambrian	To 543 million	Trilobites	Multiple collisions to the earth's crustal plates resulting in Gondwana.
PRECAMBRIAN	Vendian (Proterozoic)	To 650 million