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Units 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

References

These references will appear in the article, but this list appears only on this page.
  1. International Commission on Stratigraphy. "International Stratigraphic Chart" (PDF). Retrieved 2008-06-17.
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