Difference between revisions of "Template:Geology to Paleobiology"
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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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!Segments of rock ([[stratum|strata]]) in [[chronostratigraphy]] | !Segments of rock ([[stratum|strata]]) in [[chronostratigraphy]] | ||
Revision as of 00:17, 30 July 2015
| Segments of rock (strata) in chronostratigraphy | Time spans in geochronology | Notes to geochronological units |
|---|---|---|
| 4 total, half a billion years or more | ||
| 10 defined, several hundred million years | ||
| 22 defined, tens to ~one hundred million years | ||
| tens of millions of years | ||
| millions of years | ||
| 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.