Geologic ages

In the Urantia Book

# Archeozoic, prelife era

#* 1 billion to 550 million years ago (59:0.2) (78:7.4)

# Proterozoic, life-dawn era

#* 550 to 400 million years ago (58:7.1) (59:0.3)

# Paleozoic, marine-life era

#* 400 to 150 million years ago (59:0.4) (59:6.11)

#* Cambrian, trilobite age

#** 400 to 350 million years ago (59:1)

#* Ordovician, invertebrate-animal age

#** 350 to 300 million years ago (59:2)

#* Silurian, coral and brachiopod age

#** 300 to 275 million years ago (59:3)

#* Devonian, age of plant life and fishes

#** 270 to 220 million years ago (59:4)

#* Carboniferous, age of fern forests and frogs

#** 220 to 180 million years ago (59:5)

#* Permian, seed-plant age and biologic tribulation

#** 170 to 150 million years ago (59:6)

# Mesozoic, early land-life era

#* 150 to 50 million years ago (59:0.5) (60:4.6)

#* Triassic, early-reptilian age

#** 150 to 125 million years ago (60:1)

#* Jurassic, later-reptilian age

#** 125 to 100 million years ago (60:2)

#* Cretaceous, age of flowering plants and birds

#** 100 to 50 million years ago (60:3-4)

# Cenozoic, mammalian era

#* 50 million years ago to the present (61:0)

#* Eocene, early-mammal age

#** 50 to 35 million years ago (61:1)

#* Oligocene, advanced mammal age

#** 35 to 25 million years ago (61:2)

#* Miocene, age of elephant and horse

#** 25 to 10 million years ago (61:3.15)

#* Pliocene, mammalian migration stage

#** 10 to 1 million years ago (61:4)

#* Pleistocene, ice age

#** 2 million to 100,000 years ago (61:5-7)

#* Holocene, post-glacial period

#** 35,000 years ago to the present (61:7.18)

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