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Show 74 NEWBR. PLIOCBNE PEittOD· [Ch; vr. hists on which part of the h. 1..11 • lin d The calcareous sc ' . tgu y me e . . h fractured, and dtp at an town of Lentini is built, are muc th north·west. In some of the angle of twenty.five degrees to e d' . th b d d nticlinal tp IS seen, e e s valleys in the neighbourhoo an a tl st and on the other on one side being inclined to the nor 1-we ' to the south·east. f s· 'ly which I examined Throu(J'hout a considerable part o tel , 5 the dips of the tertt. ary st ra t a were north-east arid Tso uth-west; as for example, m. t1 1 e di 8 t r ict included between erranuova, Gi~ rgenti. Ca1 t am.s e tta , a nd Piazza where there ate several J parallel h'. nes, or r id ges 0 f elevation ' which run north-west and south-east. ( 75 ) CHAPTER VII. Murine and volcanic formations at the base of Etna-Their connexion with the strata of the Val di N oto-Bay of Trezza-Cyclopian isles-Fossil shells of recent species-Basalt and altered rocks in the Isle of Cyclops-Submarine lavas of the Bay of Trezza not currents from Etna-Internal structure of the cone of Etna-Val di Calanna-Val del Bove not an ancient crater-Its precipices intersected by countless dikes-Scenery of the Val del Bove-Form, composition, and origin of the dikes-Lavas and breccias intersected by them. MARINE AND VOLCANIC FORMATIONS AT THE BASE OF ETNA. THE phenomena considered in the last chapter suggest many theoretical views of the highest interest in Geology; but before we enter upon these topics we are desirous of describing some formations in Valdemone, which are analogous to those of the Val di Noto, and to point out the relation of such rocks to the modern lavas of Etna. If the traveller passes along the table-land~ formed by the great limestone of the Val di Noto, until it terminates suddenly near Primosole, he there sees the plain of Catania at his feet, No.ll. ~ ·. View of Etna from the 8W1&mit of lite limestone platform of Pt·imoaole. a, Highest cone. o, Montagnuola. c, Monte Minardo, with smaller lateral cones above. d, Town of Licodia dei Monaci. e, Marine formation called creta, argillaceous and sandy beds with a few shells, and associated volcanic rocks. f, Escarpment of stratified subaqueous volcanic tuff, &c., north-west of Catania. g, Town of Catania. It, i, Dotted line expressing the highest boundary along which the marine strata are occasionally seen. It, Plain of Catania. t, Limestone platform of Prj111os9le of ~he uew~r Plioce~e. p,t1 La Motta eli Catania. |
