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strata units of the geologic record |
units of the geological time system |
Main article: geologic time scale |
| Eonothem | Eon (geology) | largest spans of years |
| Erathem | Era (geology) | 3 total, hundreds of millions of years |
| System (geology) | Period (geology) | Some familiar names |
| Series (geology) | Epoch (geology) | tens of millions of years |
| Stage (geology) | Age (geology) | millions of years |
if the strata has good dating characteristics. | ||
| Chronozone | Chron | only in more recent strata* |
| * Most and the most time specific time divisions | ||
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- International Commission on Stratigraphy. "International Stratigraphic Chart" (PDF). Retrieved 2008-06-17.