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Rugose CoralsLower CretaceousStratotype SectionBrachiopodsInner MongoliaMiddle DevonianLithostratigraphic UnitBrachiopodDevonian-Carboniferous BoundaryConodont ZoneTaxonomyTrace FossilPlanktonic ForaminiferaAmmonitesMiddle EoceneTwo NewSystematic PalaeontologyFaunaBiostratigraphyCarbonate Ramp