The biostratigraphic subdivisions of the Middle Cambrian sediments on the southern side of the Montagne Noire (Languedoc, France) are here analysed and revised. The proposed units are grouped into two stages: the Caesaraugustian Stage, previously defined for the Iberian Peninsula, and one newly erected stage, the so-called Languedocian. The problems of the Lower-Middle and Middle-Upper Cambrian boundaries and correlations with neighbouring areas are discussed. These stages are proposed as reference chronostratigraphic units in south-western Europe.

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