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WikiPedia: Tầng_Chatti http://stratigraphy.science.purdue.edu/charts/Time... http://pubs.usgs.gov/fs/2007/3015/fs2007-3015.pdf http://paleodb.org/cgi-bin/bridge.pl?action=proces... http://www.stratigraphy.org/ICSchart/ChronostratCh... http://www.stratigraphy.org/index.php/ics-chart-ti... https://web.archive.org/web/20060518100342/http://... https://web.archive.org/web/20100822030348/http://... https://www.jstor.org/stable/6334 https://stratigraphy.org/gssps/ https://commons.wikimedia.org/wiki/Category:Chatti...