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Rescuing 1 sources and tagging 0 as dead.) #IABot (v2.0.8 |
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Baris 6:
* {{en}} [http://www.stratigraphy.org/cheu.pdf International Stratigraphic Chart] from the [[International Commission on Stratigraphy]]
* {{en}} [http://www2.nature.nps.gov/geology/usgsnps/gtime/gtime1.html USA National Park Service] {{Webarchive|url=https://web.archive.org/web/20080923230940/http://www.nature.nps.gov/geology/USGSNPS/gtime/gtime1.html |date=2008-09-23 }}
* {{en}} [http://astro.wsu.edu/worthey/earth/html/md08.html Washington State University]
* {{en}} [http://www.ucmp.berkeley.edu/help/timeform.html Web Geological Time Machine]
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