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|+]<ref>{{citation | first1=K.M. |last1=Cohen |first2=S. |last2=Finney |first3=P.L. |last3=Gibbard|title=International Chronostratigraphic Chart |year=2015| publisher = International Commission on Stratigraphy |url=http://www.stratigraphy.org/ICSchart/ChronostratChart2015-01.pdf }}.</ref> | |||
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|colspan=3|<span style="float:right;"><small><small><span class="plainlinksneverexpand"><small>  </small></span></small><small></span><center><big>'''Units in geochronology and stratigraphy'''</big></center> | |||
|- valign="bottom" | |||
|<center>]<br/>] of the<br/> ]</big></center> | |||
|<center>]<br/> units of the<br/>] </center> | |||
| ''Main article:'' ]<br/><br/><hr/><center>'''Notes'''</center> | |||
|- | |- | ||
!Segments of rock (]) in ] | |||
| <center>]</center>||<center>]</center>||4 total, largest spans of years | |||
!Time spans in ] | |||
!Notes to<br/>geochronological units | |||
|- | |- | ||
| |
| 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 | |||
| <center>]</center> || <center>]</center>|| Some familiar names, defined in<br/>21 major divisions and 2 minor | |||
|- | |- | ||
| |
| 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;" | ] || 99 defined, millions of years | |||
|colspan=3|<small><center>Outside the hierarchy, units cross stage and age boundaries as needed<br/>if the ] has good dating characteristics.</center></small> | |||
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| style="text-align:center;" | ] || style="text-align:center;" | ] || subdivision of an age, not used by the ICS timescale | |||
|] || ] || only in more recent strata<big><big>'''<nowiki>*</nowiki>'''</big></big> | |||
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{{Template reference list}} | |||
|colspan=3|<big><big>'''<nowiki>*</nowiki>'''</big></big> Most and ''the most time specific'' time divisions<ref | |||
>{{cite web|url=http://www.stratigraphy.org/chus.pdf|accessdate=2008-06-17|title=International Stratigraphic Chart|author=]}}</ref | |||
] | |||
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Latest revision as of 19:49, 7 September 2021
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.- Cohen, K.M.; Finney, S.; Gibbard, P.L. (2015), International Chronostratigraphic Chart (PDF), International Commission on Stratigraphy.