In ascending order the Cason Shale consists of phosphatic sandstone and shale, oölitic limestone, pelmatozoan limestone, and sandy, calcareous shale containing abundant ellipsoidal algal growths. Conodonts from these units and the overlying St. Clair and Lafferty Limestones indicate the occurrence of Bereich I and the celloni-Zone, amorphognathoides-Zone, sagittus-Zone, and siluricus-Zone of Walliser's (1964) European conodont zonation.

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