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Namurian The lowermost series in the Silesian (Carboniferous) of Europe, underlain by the Visean, overlain by the Westphalian, and subdivided into Namurian A, B, and C. It is dated at 333–315 Ma and is contemporaneous with the Millstone Grit Series (western Europe) and the Serpukhovian and Lower Bashkirian Series (eastern Europe).