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Recent (Holocene) Epoch
end of the last Ice Age; rise of human civilization -
Pleistocene Epoch
Ice Age; mass extinctions; rise of man -
Pliocene Epoch
peak of mammals -
Miocene Epoch
rise of grazing mammas -
Permian
modern insects; reptiles spread; evergreens; extinction of trilobites -
Pennsylvanian
giant insects; first reptiles -
Oligocene Epoch
primitives apes; whales; first modern mammals -
Mississippian
amphibians spread; sharks and bony fish; winged insects -
Archean
earth became habitable -
Hadean
formation of earth -
Devonian
first amphibians; fresh water fish; wingless insects -
Silurian
land colonized by arthropods and plants -
Ordovician
trilobites abundant; vertebrates increase -
Cambrian
sudden explosion of life -
Eocene Epoch
First horses -
Paleocene Epoch
Early mammals became dominant; rise of modern birds -
Cretaceous
mass extinctions; flowering plants appear -
Jurassic
giant dinosaurs; early birds; first mammals -
Proterozoic
simple multicellular sea creatures develop -
Triassic
first dinosaurs; rise of mammal-like reptiles
