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Quaternary Period
0 – 1.8 Ma. Ice ages.
Neogene Period
1.8 – 24 Ma. Establishment of regional differences in floras, including temperate floras and grasslands.
Paleogene Period
24 – 65 Ma. First grasses, first horses, rapid diversification of mammals.
Cretaceous Period
65 – 144 Ma. Extinction of dinosaurs, origin and diversification of Angiosperms.
Jurassic Period
144 – 205 Ma. Rise of modern ferns, diversification of conifers.
Triassic Period
205 – 248 Ma. Cycads and Ginkgos dominant. Massive biotic extinction at the Permian-Triassic boundary.
Permian Period
248 – 295 Ma. Spread of upland floras into lowlands, demise of lowland swamps.
Carboniferous Period
295 – 354 Ma. Major interval of coal formations, forest dominance by arborescent lycopods. First land winged insects, first land vertebrates.
Devonian Period
354 – 416 Ma. Diversification of plants, first seed plants, first sharks.