Template: Geology to Paleobiology

e  hUnits in geochronology and stratigraphy
Segments of rock (strata) in chronostratigraphy	Periods of time in geochronology	Notes
Eonothem	Eon	4 total, half a billion years or more
Erathem	Era	12 total, several hundred million years
System	Period
Series	Epoch	tens of millions of years
Stage	Age	millions of years
Chronozone	Chron	smaller than an age/stage, not used by the ICS timescale

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