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| | <center>]</center> || <center>Age</center> || Over 100, each spanning millions of years | | <center>]</center> || <center>Age</center> || Over 100, each spanning millions of years | ||
| |- | |- | ||
| ⚫ | |<center>]</center> || <center>Chron</center> || Generic term for any identifiable time period; not necessarily part of a hierarchy | ||
| |colspan=3|<center>Outside the hierarchy, units cross stage and age boundaries as needed<br/>if the ] has good dating characteristics.{{huh}}<!--Example?--></center> | |||
| |- | |||
| ⚫ | |<center>]</center> || <center>Chron</center> || |
||
| |} | |} | ||
| <noinclude> | <noinclude> | ||
Revision as of 07:05, 25 September 2008
| e h | ||
| Segments of rock (strata) in chronostratigraphy | Periods of time in geochronology | Notes |
|---|---|---|
| 4 total, half a billion years or more | ||
| 12 total, several hundred million years | ||
| 21 major and 2 minor | ||
| 48 total, tens of millions of years | ||
| Over 100, each spanning millions of years | ||
| Generic term for any identifiable time period; not necessarily part of a hierarchy | ||
- International Commission on Stratigraphy. "International Stratigraphic Chart" (PDF). Retrieved 2008-06-17.