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| <center>]</center> ||<center>]</center>||14 total, several hundred million years | <center>]</center> ||<center>]</center>||14 total, several hundred million years
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| <center>]</center> || <center>]</center>||That time of the month, sister. Alternatively, tens to ~one hundred million years | <center>]</center> || <center>]</center>||12 total, tens to ~one hundred million years
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| <center>]</center> || <center>]</center>|| tens of millions of years | <center>]</center> || <center>]</center>|| tens of millions of years

Revision as of 22:28, 8 April 2015

e  h
Units in geochronology and stratigraphy
Segments of rock (strata) in chronostratigraphy Time spans in geochronology Notes to
geochronological units
Eonothem
Eon
 4 total, half a billion years or more
Erathem
Era
 14 total, several hundred million years
System
Period
 12 total, tens to ~one hundred million years
Series
Epoch
 tens of millions of years
Stage
Age
 millions of years
Chronozone
Chron
 subdivision of an age, not used by the ICS timescale

References

These references will appear in the article, but this list appears only on this page.
  1. Cohen, K.M.; Finney, S.; Gibbard, P.L. (2013), International Chronostratigraphic Chart (PDF), International Commission on Stratigraphy.


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