This is a documentation subpage for Template:Period start. It may contain usage information, categories and other content that is not part of the original template page.

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

((Period start|Cretaceous))

produces:

145

((Period start|Cretaceous|-1))

produces:

150

• Template:Period start error
• Template:Period end
• Template:Period color
• Template:Next period

• Periods from the International Commission on Stratigraphy's stratigraphical timescale.
• Burgess shale age from Butterfield, Nicholas J. (December 2006). "Hooking some stem-group "worms": fossil lophotrochozoans in the Burgess Shale". BioEssays. 28 (12): 1161–1166. doi:10.1002/bies.20507.
• Cambrian stages from English, Adam M.; Babcock, Loren E. (September 2010). "Census of the Indian Springs Lagerstätte, Poleta Formation (Cambrian), western Nevada, USA". Palaeogeography, Palaeoclimatology, Palaeoecology. 295 (1–2): 236–244. 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.