Abstract
Extensive work by the International Subcommission on OrdovicianStratigraphy (ISOS) has led to considerable progress in the establish-ment of a new chronostratigraphic classification of the OrdovicianSystem which now includes seven stages (Webby 1998; Finney 2005).However, until recently, only three of these global stages havebeen formally named and ratified by the International Commissionon Stratigraphy (ICS). These are the lower stage of the LowerOrdovician (Tremadocian or 1
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