Template:Period start/doc

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Usage

Use the syntax {{Period start|period name|rounding (optional)}}

{{Period start|Cretaceous}}

produces:

145
{{Period start|Cretaceous|-1}}

produces:

150

References

Periods from the International Commission on Stratigraphy's stratigraphical timescale.

Burgess shale age from Butterfield, N (2006). Hooking some stem-group "worms": fossil lophotrochozoans in the Burgess Shale. Bioessays 28, 1161–1166. Template:Doi.

Cambrian stages from Template:Doi

Mayanian dates from Khomentovsky (2008). Mayanian (1100–850 Ma) – Prebaikalian Upper Riphean of Siberia. Russian Geology and Geophysics 49 (1). Template:Doi.

Period templates