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Published online by Cambridge University Press: 01 May 2009
The development of a series of internationally acceptable chronostratigraphical units initially grew up through agreed use. Today's requirement of endorsement by the International Commission on Stratigraphy has resulted in the official rejection of names which are perfectly valid and still essential in the parts of the world for which they were introduced. Recognition of this fact is urged, by the acceptance of the Secondary Standards as locally defined chronostratigraphical units pending possible future correlation with the primary standard.