Geologic time scale (650mya--Present)

Quaternary

Evolution of Humans

Tertiary

Mammals Diversify

Cretaceous

Extinction of dinosaurs, first primates, first flowering plants

Jurassic

First Birds, dinosaurs diversify

Triassic

First mammals, first dinosaurs

Permian

Major Extinctions, Reptiles Diversify

Carboniferous

First reptiles, scale trees, seed ferns

Devonian

First amphibians, jawed fishes diversify

Silurian

First vascular land plants

Ordovician

sudden diversification of metazoan families

Cambrian

first fishes, first chordates

Late Proterozoic

first skeletal elements, first soft-bodied metazoans, first animal traces