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|colspan=3|<span style="float:right;"><small><small><span class="plainlinksneverexpand"><small>  </small></span></small><small></span><center><big>'''Units in geochronology and stratigraphy'''</big></center> | |colspan=3|<span style="float:right;"><small><small><span class="plainlinksneverexpand"><small>  </small></span></small><small></span><center><big>'''Units in geochronology and stratigraphy'''</big></center> |
Revision as of 23:10, 3 July 2008
e h | ||
strata units of the geologic record |
units of the geological time system |
Main article: geologic time scale |
3 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* |
* Most and the most time specific time divisions |
This biology article is a stub. You can help Misplaced Pages by expanding it. |
- International Commission on Stratigraphy. "International Stratigraphic Chart" (PDF). Retrieved 2008-06-17.