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 Spirifer disjunctus, Sow. Syn. Sp. Verneuilii, Murch. Upper Devonian, Boulogne. Phacops latifrons, Bronn. Characteristic of the Devonian in Eu- rope, Asia, and N. and S. America. Petherwyn Group.—A series of limestones and slates best developed at Petherwyn, in Cornwall. Among many other fossils, the Clymenia linearis (fig. 603) and the minute crustacean, Cypridina serrato-striata (fig. 604), are so characteristi

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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 Spirifer disjunctus, Sow. Syn. Sp. Verneuilii, Murch. Upper Devonian, Boulogne. Phacops latifrons, Bronn. Characteristic of the Devonian in Eu- rope, Asia, and N. and S. America. Petherwyn Group.—A series of limestones and slates best developed at Petherwyn, in Cornwall. Among many other fossils, the Clymenia linearis (fig. 603) and the minute crustacean, Cypridina serrato-striata (fig. 604), are so characteristic of these upper beds in Belgium, the

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