-
Precambrian Era
- - 4.6 bya
- - Earth forms
- - life begins
-
Paleozoic Era
- - 542 mya
- - many animal lineages appear
-
Hadeon Eon
creation of Earth/solar system (4.5bya)
-
Archaean Eon
origins of life (3.8bya)
-
Proterozoic Eon
oxygen in atmosphere, beginnings of multicellular life (2.5bya)
-
Cambrian Period
explosion of life, like algae and more marine invertebrates (542mya)
-
Ordvician Period
Echinoderms - sea stars/urchins (488mya)
-
Devonian Period
upland plant communities, diversify fish (416mya)
-
Carboniferious Period
insects diversify, swamps (make coal)
(359mya)
-
Permian Era
coal forming swamps diminish - ends with mass extinction
(300mya)
-
Mesozoic Era
Age of the reptiles (250mya)
-
Triassic Period
gymnosperms dominant land plants, dinosaurs
(250mya)
-
Jurassic Period
first mammals and angiosperms, dinosaurs still the head animal
(200mya)
-
Cretaceous Period
Dinosaurs and angiosperms diversify
(145mya)
-
Cenozoic Era
Age of Mammals (65.5mya)
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