Origins
Precambrian
Cambrian (541 - 485.4 Mya)
Ordovician (485.4 - 443.8 Mya)
Silurian (443.8 - 419.2 Mya)
Devonian (419.2 - 358.9 Mya)
Carboniferous (358.9 - 298.9 Mya)
Permian (298.9 - 251.9 Mya)
Triassic (251.9 - 201.3 Mya)
Jurassic (201.3 - 145 Mya)
Cretaceous (145 - 66 Mya)
Paleogene (66 - 23.03 Mya)
Neogene 23.03 - 2.588 Mya
Pleistocene (2.588 Mya - 11,700 BP
Mesolithic(11,700-5000 BP)
Chalcolithic (5000 - 3500)
3400s BCE
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