Lithic and Conodont Succession of Silurian Strata, Batesville District, Arkansas
In ascending order the Cason Shale consists of phosphatic sandstone and shale, oolitic 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 Walliser9s (1964) European conodont zonation.