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The last mentioned strata consist of dark-coloured micaceous flags, frequently calcareous, with a great thickness of shales, generally black, below them. The same beds are also seen at Builth, in Radnorshire, where they are interstratified with volcanic matter. Diplograpsus pristis, Hisinger. Rastrites peregrinus, Barrande. Scotland; Bohemia; Saxony. Diplograpsus folium, Hisinger.
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