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| | Informat.io on List Of Time Periods (Site not responding. Last check: 2007-11-07) |
 | | Geologic time units are (in order of descending specificity) eons, eras, periods, epochs, and ages; and the corresponding chronostratigraphic units, which measure "rock-time", are eonothems, erathems, systems, series, and stages. |
 | | A period between epoch dates is known as a calendar era. |
 | | Periodization for a discussion of the tendency to try to fit history into non-overlapping periods. |
| www.informat.io /?title=list-of-time-periods (779 words) |
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