A Manual of Elementary Geology Or the Ancient Changes of the Earth And Its Inh
A Manual of Elementary Geology Or the Ancient Changes of the Earth And Its Inh
Charles Lyell
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* garded as the extremity of a promontory severed from the main land Here numerous proofs are seen of submarine eruptions, by which the argillaceous and sandy strata were invaded and cut through, and tu- faceous breccias formed. Inclosed in these breccias are many angular * This view of the Isle of Cyclops is from an original drawing by my friend the late Captain Basil Hall, R. N. D D 402 VOLCANIC ROCKS OF [Cn. XXX. Fig. 465. and hardened fragments of laminated clay in different states of alter...- ation by heat, and intermixed with volcanic sands. The loftiest of the Cyclopian islets, or rather rocks, is about 200 feet in height, the summit being formed of a mass of stratified clay, the laminge of which are occasionally subdivided by thin arenaceous layers. These strata dip to the N. W. , and rest on a mass of columnar lava (see fig. 464. ) in which the tops of the pillars are weathered, and so rounded as to be often hemispherical. In some places in the adjoining and largest islet of the group, which lies to the north-east- ward of that represented in the drawing (fig.
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