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|+[[Geologic time scale|Units in geochronology and stratigraphy]]<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;"><span class="plainlinksneverexpand">[{{fullurl:Template:Geology_to_Paleobiology|action=edit}} e]  [{{fullurl:Template:Geology_to_Paleobiology|action=history}} h]</span></span><center><big>'''[[Geologic time scale|Units in geochronology and stratigraphy]]'''</big><ref>{{cite web|url=http://www.stratigraphy.org/upload/ISChart2009.pdf|accessdate=2009-09-25|title=International Stratigraphic Chart|author=[[International Commission on Stratigraphy]]}}</ref></center> |
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!Segments of rock ([[stratum|strata]]) in [[chronostratigraphy]] |
!Segments of rock ([[stratum|strata]]) in [[chronostratigraphy]] |
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!Time spans in [[geochronology]] |
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!Notes to<br/>geochronological units |
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!Notes |
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| style="text-align:center;" | [[Eonothem]] || style="text-align:center;" | [[Geologic time scale#Terminology|Eon]] || 4 total, half a billion years or more |
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| style="text-align:center;" | [[Erathem]] || style="text-align:center;" | [[Geologic time scale#Terminology|Era]] || 10 defined, several hundred million years |
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| style="text-align:center;" | [[System (stratigraphy)|System]] || style="text-align:center;" | [[Geologic time scale#Terminology|Period]] || 22 defined, tens to ~one hundred million years |
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| style="text-align:center;" | [[Series (stratigraphy)|Series]] || style="text-align:center;" | [[Geologic time scale#Terminology|Epoch]] || 34 defined, tens of millions of years |
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| style="text-align:center;" | [[Stage (stratigraphy)|Stage]] || style="text-align:center;" | [[Geologic time scale#Terminology|Age]] || 99 defined, millions of years |
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| style="text-align:center;" | [[Chronozone]] || style="text-align:center;" | [[Polarity chron|Chron]] || subdivision of an age, not used by the ICS timescale |
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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 |
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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
- ^ Cohen, K.M.; Finney, S.; Gibbard, P.L. (2015), International Chronostratigraphic Chart (PDF), International Commission on Stratigraphy.