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Template:Geology to Paleobiology

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Units in geochronology and stratigraphy
Chronostratigraphic
strata units of the
geologic record
Geochronological
units of the
geological time system
Main article: geologic time scale


Notes
Eonothem
Eon
4 total, largest spans of years
Erathem
Era
 12 total, roughly span multiples
of a hundred million years
System
Period
 Some familiar names, defined in
21 major divisions and 2 minor
Series
Epoch
48 units & each spanning
tens of millions of years
Stage
Age
100+ units & most all
spanning millions of years
Outside the heirarchy, units cross stage and age boundaries as needed
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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  1. International Commission on Stratigraphy. "International Stratigraphic Chart" (PDF). Retrieved 2008-06-17.
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