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* Hedberg, H.D., (editor), ''International stratigraphic guide: A guide to stratigraphic classification, terminology, and procedure'', New York, John Wiley and Sons, 1976
* [http://web.archive.org/web/http://www.stratigraphy.org/column.php?id=Chart/Time%20Scale International Chronostratigraphic Chart] de la [[Comisión Internacional de Estratigrafía]]
* [http://www2.nature.nps.gov/geology/usgsnps/gtime/gtime1.html USA National Park Service]
* [http://astro.wsu.edu/worthey/earth/html/md08.html Washington State University]
 
==Enlaces externos ==
*[http://web.archive.org/web/http://www.stratigraphy.org/over.htm The Global Boundary Stratotype Section and Point (GSSP)]: overview
*[http://web.archive.org/web/http://www.stratigraphy.org/gssp.htm Chart of The Global Boundary Stratotype Sections and Points (GSSP)]: chart
*[http://www.rocksandminerals.com/geotime/geotime.htm Geotime chart displaying geologic time periods compared to the fossil record] - Deals with chronology and classifications for laymen (not GSSPs)
 
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