Silur: Perbedaan antara revisi

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* [http://www.ucmp.berkeley.edu/silurian/silurian.html UCMP Berkeley:The Silurian]
* [http://tapestry.usgs.gov/ages/silurdevon.html USGS:Silurian and Devonian Rocks (U.S.)]
* {{cite web | title=International Commission on Stratigraphy (ICS)| work=Geologic Time Scale 2004| url=http://www.stratigraphy.org/ | accessmonthdayaccessdaymonth=19 September| accessyear=2005}}
* [http://www.geo-lieven.com/erdzeitalter/silur/silur.htm Examples of Silurian Fossils]
* [http://www.palaeos.com/Paleozoic/Silurian/Silurian.htm#history Paleos:Silurian]