International Stratigraphic Chart 2012, International Commission on Stratigraphy, Available at: http://www.stratigraphy.org/index.php/ics-chart-timescale

Global chronostratigraphical correlation table for the last 2.7 million years, v 2010, International Commission on Stratigraphy, Available at: http://www.stratigraphy.org/index.php/ics-chart-timescale

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