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Show xxviii LIST OF PLATES. or in the Miocene or Eocene formations, but occurs both in the Newer and Older Pliocene strata. Mitra plicatula has been found only in the older Pliocene deposits. The Turbo rugosus was considered as exclusively Pliocene when selected by M. Deshayes, but M. Boue h~s since found it in t?e Mioce~e strata at Vienna and Moravia (see Tables, Appendix I. p. 26). Buccinum semistriatum is also a Miocene shell, but was inserted as being peculiarly abundant in the Pliocene strata, Plate II. All the shells ngured in this plate, except Cardita Ajar, are very characteristic of the Miocene formations; that is to say, they are found in that period and no other. Cardita Ajar is also very common in the Miocene strata, but is also a Recent species. It has not yet been observed in any Pliocene deposit. Plate III. The species of shells ngured in this plate are characteristic of the Eocene period, as being exclusively confined to deposits of that period, and for the most part abundant in them. Plate IV. The microscopic shells of the order Cephalopoda, figured in this plate, are characteristic of the Eocene period, and are distinct from the microscopic shells of the Older Pliocene formations of Italy. The figures are from unpublished drawings by M. Deshayes, who has selected some of the most remarkable types of form. The reader will observe, that the minute points, ngures 4, 8, 11, 14, and 18, indicate the natural size of the species which are represented. (For observations on these shel1s see p. 251.) Plate V. Geological Map of the south-east of England, exhibiting the Denudation of the Weald. 'l"'his map has been compiled in great part from Mr. Greenough's Geological Map of England, and Mr. Mantell's Map of the south-east of England. (Illustrations of Geol. of Sussex, and fossils of Tilgate Forest, 1827.) The eastern extremity of the 'denudation' is reduced from Mr. Murchison's Map of that district. (Geol. Trans., 2nd series, vol. ii. part i. plate 14.) The object of this map is fully explained in chapters xxi. and xxii. of this volume. LIST OF WOOD-CUTS. No. Page 1. Diagram showing the order of succession of stratified masses 15 2. Diagram showing the relative position of the Primary, Secondary, and Tertiary strata 16 3, Diagram showing the relative age of the strata of the Paris basin, and those of the basin of the Loire, in Touraine 20 4. Diagram showing the same in tho strata of SufFolk and Piedmont 21 5. Diagram containing sections in the Val eli Noto, Sicily 64 ~:}Horizontal sections of dikes near Palagonia 69 8, Section of horizontal limestone in contact with inclined strata of TufF in the hill of Novera, near Vizzini 70 9, Section of calcareous grit and pepe1·ino, east of Palagonia, south side of the pass 72 10. Section of the same beds on the north side of the pass 72 11. Outline view of the cone of Etna from the summit of the limestone platform of Primosole 75 I 2. Section from Paterno by Lago di N aftia to Palagonia 76 13. Section of beds of clay and sand capped by columnar basalt and con-glomerate at La Motta, near Catania 77 14. View of the Isle of Cyclops, in the Bay of Trezza 7!) 15, Diagram showing the contortions in the newer Pliocene strata of the Isle of Cyclops 80 16. Horizontal section showing the invasion of the newer Pliocene strata of the Isle of Cyclops by lava 81 17. Wood-cut showing the great valley on the east side of Etna 83 18. Diagram explanatory of the origin of the Valleys of Calanna and St. Giacomo, on Etna 86 19. View of dikes at the base of the Serre del Solfizio, Etna 90 20. View of tortuous dikes or veins of lava, Punto di Guimento, Etna 91 21. View of the rocks Fiuochio, Capra, and Musara, in the Val del Bove 92 22. View from the summit of Etna into tho Val del Bove 93 23. View of the Valley called Gozzo degli Martiri, below Melilli 110 24. Diagram showing the manner of obliteration of successive lines of sea-clifF 11 1 25. View of dikes or veins of lava at the Pun to del N as one, on Somma 122 26. Diagram showing the superposition of alluvium and cave deposits con-taining extinct quadrupeds to a limestone containing recent shells 139 27. Diagram showing the position of the Cuve of San Ciro, near Palermo 141 28. Diagram showing the position of Tertiary strata at Genoa 166 |