This is an old revision of this page, as edited by Beland (talk | contribs) at 07:05, 25 September 2008 (clarify based on talk page comments). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.
Revision as of 07:05, 25 September 2008 by Beland (talk | contribs) (clarify based on talk page comments)(diff) ← Previous revision | Latest revision (diff) | Newer revision → (diff)| 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.