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