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

{{Period start|Cretaceous}}

produces:

145.5


{{Period start|Cretaceous|-1}}

produces:

150


References

àtúnṣe

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

Burgess shale age from Àdàkọ:Cite doi

Cambrian stages from Àdàkọ:Cite doi

Mayanian dates from Khomentovsky, V; Nagovitsin, K; Postnikov, A (2008). "Mayanian (1100–850 Ma) – Prebaikalian Upper Riphean of Siberia". Russian Geology and Geophysics 49: 1. doi:10.1016/j.rgg.2007.12.001. 

See also

àtúnṣe

Templates for retrieving data about geological periods: