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WikiPedia: Kỷ_Silur http://www.palaeos.com/Paleozoic/Silurian/Silurian... http://www.ucmp.berkeley.edu/silurian/silurian.htm... //www.ncbi.nlm.nih.gov/pubmed/18832639 http://tapestry.usgs.gov/ages/silurdevon.html //dx.doi.org/10.1126%2Fscience.1161648 http://www.paleoportal.org/time_space/period.php?p... http://www.stratigraphy.org/ http://www.stratigraphy.org/ICSchart/ChronostratCh... http://www.stratigraphy.org/gssp.htm https://commons.wikimedia.org/wiki/Category:Siluri...