Gibbard, Phillip; Head, Martin J.; Walker, Michael J.C.; Alloway, B.; Beu, A.; Coltorti, M.; Hall, V.M.; Jiaqi, Liu; Knudsen , K.L.; van Kolfschoten, T.; Pillans, Bradley
In June 2009, the Executive Committee of the International Union of Geological Sciences (IUGS) formally ratified a proposal by the International Commission on Stratigraphy to lower the base of the Quaternary System/Period to the Global Stratotype Section
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