Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Cjl XXTV.] CLAY-IRON-STONE. 405 In the Edinburgh coal-field, at Birdiehouse, fossil fishes, mollusks, and cyprides (?), very similar to those in Shropshire and Staffordshire, have been found by Dr. Hibbert. In the coal-field also of Yorkshire, there are freshwater strata, some of which contain shells referred to the family Unionidce ; but in the midst of the series there is one thin but very widely spread stratum, a
Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Cjl XXTV.] CLAY-IRON-STONE. 405 In the Edinburgh coal-field, at Birdiehouse, fossil fishes, mollusks, and cyprides (?), very similar to those in Shropshire and Staffordshire, have been found by Dr. Hibbert. In the coal-field also of Yorkshire, there are freshwater strata, some of which contain shells referred to the family Unionidce ; but in the midst of the series there is one thin but very widely spread stratum, abounding in fishes and marine shells, such as Goniatites Listeri (fig. 550), Ortkoceras and Avicula papyracea, Goldf. (fig. 551). Fig. 551.
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