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The Namurian is a stage in the regional stratigraphy of northwest Europe with an age between roughly 326 and 313 Ma . It is a subdivision of the Carboniferous system or period and the regional Silesian series. The Namurian is named for the Belgian city and province of Namur where strata of this age occur . The Millstone Grit Group in the lithostratigraphy of northern England and parts of Wales is also of Namurian age.