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Template:Period start

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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. A change log is listed at http://www.stratigraphy.org/ICSchart/ChangeLog2012-2013-2014-2015.txt .

Burgess shale age from Pushie, M. J.; Pratt, B. R.; MacDonald, T. C.; George, G. N.; Pickering, I. J. (2014). "Evidence for Biogenic Copper (Hemocyanin) in the Middle Cambrian Arthropod Marrella from the Burgess Shale". PALAIOS 29 (10): 512. doi:10.2110/palo.2014.073. 

Cambrian stages from English, Adam M.; Babcock, Loren E. (2010). "Census of the Indian Springs Lagerstätte, Poleta Formation (Cambrian), western Nevada, USA". Palaeogeography, Palaeoclimatology, Palaeoecology 295 (1–2): 236. doi:10.1016/j.palaeo.2010.05.041. 

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): 1. doi:10.1016/j.rgg.2007.12.001. 

Period templates

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