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Template:Ordovician graphical timeline

Frae Wikipedia, the free beuk o knawledge
Key events in the Ordovician
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Key events o the Ordovician Period.
ICS approved stages.

Axis scale: millions o years ago.[2]

References

  1. Wellman, C.H.; Gray, J. (2000). "The microfossil record of early land plants". Phil. Trans. R. Soc. B. 355 (1398): 717–732. doi:10.1098/rstb.2000.0612. PMC 1692785. PMID 10905606.
  2. Gradstein, F. M., ed. (2012). The Geologic Time Scale 2012. Elsevier Science Ltd. p. 504. ISBN 978-0444594259.