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==Additional sources of information==

==Useful links==

* [https://en.wikipedia.org/wiki/Series_(stratigraphy) Series]

* [https://en.wikipedia.org/wiki/Series_(stratigraphy) Wikipedia Series article]

* [https://engineering.purdue.edu/Stratigraphy/strat_guide/chro.html Stratigraphic guide]

* [https://engineering.purdue.edu/Stratigraphy/strat_guide/chro.html Purdue University Stratigraphic guide]

* [https://en.wikipedia.org/wiki/Geologic_time_scale:Terminology Geologic time scale]

* [https://en.wikipedia.org/wiki/Geologic_time_scale:Terminology Wikipedia Geologic time scale]

==See also==

==See also==

* [[Stratigraphic system]]

* [[System]]

* [[Stratigraphic stage]]

* [[Stage]]

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