Tuedian

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• Bernician Series — In geology, Bernician Series was a term proposed by Samuel Pickworth Woodward in 1856 ( Manual of Mollusca , p. 409) for the lower portion of the Carboniferous System, below the Millstone Grit. The name was suggested by that of the ancient… …   Wikipedia

• twedian — var. tuedian …   Useful english dictionary