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Arenigian  search
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Ordovician
 ....Lower Ordovician
 .....Arenigian
NTBallantrae Complex
RTArenig
 Buchans Group
 San Juan Formation
SNEurope. Above Tremadocian, below Llanvirnian. Before 1978, also search Arenig.