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BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Mississippian
 .....Visean
BTChronostratigraphic Units
 .Phanerozoic
 ..Paleozoic
 ...Carboniferous
 ....Dinantian
 .....Visean
NTGreat Scar Limestone
 upper Visean
SNEurope. Above Tournaisian, below Namurian.