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== Usage ==
Use the syntax <code><nowiki>{{Period start|period name|rounding (optional)}}</nowiki></code>

<pre>{{Period start|Cretaceous}}</pre>
produces:

{{period start|Cretaceous}}

<pre>{{Period start|Cretaceous|-1}}</pre>
produces:

{{period start|Cretaceous|-1}}

==References==
Periods from the [http://www.geomorph.org/sp/arch/ISChart2009.pdf International Commission on Stratigraphy's stratigraphical timescale].

Burgess shale age from {{cite journal| last=Butterfield |first=N. J. |year=2006 |title=Hooking some stem-group "worms": fossil lophotrochozoans in the Burgess Shale |journal=Bioessays |volume=28 |issue=12 |pages=1161–1166 |doi=10.1002/bies.20507}}

Cambrian stages from {{cite doi|10.1016/j.palaeo.2010.05.041}}

Mayanian dates from {{cite journal | doi = 10.1016/j.rgg.2007.12.001 | title = Mayanian (1100–850 Ma) – Prebaikalian Upper Riphean of Siberia | year = 2008 | last1 = Khomentovsky |first1=V. | journal = Russian Geology and Geophysics | volume = 49 | issue = 1 | pages = 1 | last2 = Nagovitsin | first2 = K. | last3 = Postnikov | first3 = A }}

==Period templates==
*[[Template:Next period]]
*[[Template:Period color]]
*[[Template:Period end]]
*[[Template:Period end error]]
*[[Template:Period infoboxes]]
*[[Template:Period span]]
*[[Template:Period span/brief]]
*[[Template:Period start]]
*[[Template:Period start error]]

<includeonly><!-- CATEGORIES AND INTERWIKIS HERE, THANKS -->
[[Category:Geological period templates|{{PAGENAME}}]]
</includeonly>

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