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 Ch. XXHI.] PERMIAN LIMESTONES. 459 I shall proceed, therefore, to treat briefly of these subdivisions, be- ginning with tlie highest, and referring the reader, for a fuller descrip- tion of the lithological character of the whole group, as it occurs in- the north of England, to a valuable memoir by Professor Sedgwick, published in 1835.* Crystalline or Concretionary Limestone (No. 1).—This formation is seen upon the

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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 Ch. XXHI.] PERMIAN LIMESTONES. 459 I shall proceed, therefore, to treat briefly of these subdivisions, be- ginning with tlie highest, and referring the reader, for a fuller descrip- tion of the lithological character of the whole group, as it occurs in- the north of England, to a valuable memoir by Professor Sedgwick, published in 1835.* Crystalline or Concretionary Limestone (No. 1).—This formation is seen upon the coast of Durham and Yorkshire, between the 'Wear and the Tees. Among* its characteristic fossils are Schizodus Schlo- theimi (fig. 492) and Mytilus septifer (fig. 494). Tig. 492. Fig. 493. Fig. 494.

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