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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> | |||
| |- bgcolor="white" | |||
| |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><ref>{{cite web|url=http://www.stratigraphy.org/chus.pdf|accessdate=2008-06-17|title=International Stratigraphic Chart|author=]}}</ref></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>Eon</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 | |||
| | <center>]</center> ||<center>Era</center>|| 12 total, roughly span multiples <br/>of a hundred million years | |||
| |- | |- | ||
| | style="text-align:center;" | ] || style="text-align:center;" | ] || 10 defined, several hundred million years | |||
| | <center>]</center> || <center>Period</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 | |||
| | <center>]</center> || <center>Epoch </center>||48 units & each spanning<br/>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 | |||
| |colspan=3|<small><center>Outside the hierarchy, units cross stage and age boundaries as needed<br/>if the ] has good dating characteristics.</center></small> | |||
| |- | |- | ||
| |] || Chron || |
| style="text-align:center;" | ] || style="text-align:center;" | ] || subdivision of an age, not used by the ICS timescale | ||
| ⚫ | |}<noinclude> | ||
| |} | |||
| {{Template reference list}} | |||
| ⚫ | <noinclude> | ||
| ] | |||
| ] | |||
| </noinclude> | </noinclude> | ||
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.