I
Unit of geologic time during which a rock series is deposited.
It is a subdivision of a geologic period . Additional distinctions can be made by adding relative time terms, such as early, middle, and late. The use of the term is usually restricted to divisions of the Quaternary periods .
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[c mediumvioletred] (as used in expressions)
Eocene Epoch
Holocene Epoch
Recent Epoch
Miocene Epoch
Oligocene Epoch
Paleocene Epoch
Palaeocene Epoch
{{link=Pleistocene Epoch">Pleistocene Epoch
Pliocene Epoch