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a subdivision of the Carboniferous lasting from 359 to 345 million years ago. Tournai stone is a dark limestone which takes a polish and was used particularly in the Romanesque period for sculpted items such as Tournai fonts. It is sometimes called Tournai marble, though this is geologically inaccurate. These marbles are found over a large area of central Belgium and normally have white inclusions and fossils in them, but there is also the Nero Belgio which

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