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All information gathered first-hand, since 1995



Era Period Epoch
Archeozoic

Proterozoic

Paleozoic Pre-Cambrian
Cambrian
Ordovicin
Silurian
Devonian
Carboniferous
Permian



Mesozoic Triassic
Jurassic
Cretaceous
-


Lower
Upper
Cenozoic Tertiary
-
-
-
-
Quaternary
-
Paleocene
Eocene
Oligocene
Miocene
Pliocene
Pleistocene
Holocene



Sources

    1 - History of the Time Scale mainly from Wikipedia, with some from Asimov's Biographical Encyclopedia of Science and Technology; Issac Asimov; Pan; ISBN 0 330 24323 3