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!Notes to<br/>geochronological units !Notes to<br/>geochronological units
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| style="text-align:center;" | ] || style="text-align:center;" | ] || 4 total, half a billion years or more | style="text-align:center;" | ] || style="text-align:center;" | ] || 4 total, half a billion years or more
|- |-
| style="text-align:center;" | ] || style="text-align:center;" | ] || 10 defined, several hundred million years | style="text-align:center;" | ] || style="text-align:center;" | ] || 10 defined, several hundred million years
|- |-
| style="text-align:center;" | ] || style="text-align:center;" | ] || 22 defined, tens to ~one hundred million years | style="text-align:center;" | ] || style="text-align:center;" | ] || 22 defined, tens to ~one hundred million years
|- |-
| style="text-align:center;" | ] || style="text-align:center;" | ] || 34 defined, tens of millions of years | style="text-align:center;" | ] || style="text-align:center;" | ] || 34 defined, tens of millions of years
|- |-
| style="text-align:center;" | ] || style="text-align:center;" | ] || 99 defined, millions of years | style="text-align:center;" | ] || style="text-align:center;" | ] || 99 defined, millions of years
|- |-
| style="text-align:center;" | ] || style="text-align:center;" | ] || subdivision of an age, not used by the ICS timescale | style="text-align:center;" | ] || style="text-align:center;" | ] || subdivision of an age, not used by the ICS timescale
|}<noinclude> |}<noinclude>
{{Template reference list}} {{Template reference list}}

Latest revision as of 19:49, 7 September 2021

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 10 defined, several hundred million years
System Period 22 defined, tens to ~one hundred million years
Series Epoch 34 defined, tens of millions of years
Stage Age 99 defined, 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. (2015), International Chronostratigraphic Chart (PDF), International Commission on Stratigraphy.


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