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strata units of the geologic record |
units of the geological time system |
Main article: geologic time scale |
| 4 total, largest spans of years | ||
| 12 total, roughly span multiples of a hundred million years | ||
| Some familiar names, defined in 21 major divisions and 2 minor | ||
| 48 units & each spanning tens of millions of years | ||
| 100+ units & most all spanning millions of years | ||
if the strata has good dating characteristics. | ||
| Chronozone | Chron | Only in more recent strata; defined by geomagnetic reversal |
- International Commission on Stratigraphy. "International Stratigraphic Chart" (PDF). Retrieved 2008-06-17.