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Conodont FaunasConodont BiostratigraphyConodont ZonesCentral United StatesMorphological VariationMiddle OrdovicianEarly DevonianLower JurassicArctic CanadaLate DevonianMass ExtinctionSpecies LevelType MaterialPaleontologyCarbonate Ramp DepositsDissolution of LimestoneStratigraphic OccurrenceSystematic PaleontologyCarbonate ProductivityBiological Systematics