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In geology, the Arenigian (or 'Arenig') refers both to a time interval during the LowerOrdovician period and also to the suite of rocks which were deposited during this interval. The time interval which was ranked as a series or stage overlaps with the official ICS-stages Floian, Dapingian and the lowest Darriwilian. The Arenigian succeeds the Tremadocian, a regional and ICS-stage, and precedes the regional stageLlanvirnium.[1]
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- For the mountains in Wales, see Arenigs.