Stage (geology)

The stage is the fundamental chronostratigraphic unit.

Being chronostratigraphic units, stages represent the body of rocks formed during a given interval of geologic time. The corresponding geochronologic units are called ages.

Stages/ages are formally defined following the indications of the ICS (International Commission on Stratigraphy). More specifically, stages/ages are defined by the GSSP of their base, their top being defined by the GSSP of the overlying stage/age.

A list of stages/ages may be found [[List of Global Boundary Stratotype Sections and Points |here]].

## See also

* Age (geology)
* Chronostratigraphy
* Geologic time scale
* Stratigraphy

## External links

* International Commission on Stratigraphy

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