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Under construction
Series: Upper (458.4 - 443.8 Ma) (chronostratigraphic unit)
Classification by:

stratigraphic intervals
   (System) †Ordovician (485.4 - 443.8 Ma)
     (Series) †Upper (458.4 - 443.8 Ma)
       1 (Stage) †Ashgillian

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Last updated: 28 Aug 2026