The Tournaisian is in the ICS geologic timescale the lowest stage or oldest age of the Mississippian, the oldest subsystem of the Carboniferous. The Tournaisian age lasted from {Geologic Ages Inline|Tournaisian} Ma to {Geologic Ages Inline|Visean} Ma. It is preceded by the Famennian (the uppermost stage of the Devonian) and is followed by the Vis
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