. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Ch. XXX.] POST-PLIOCENE VOLCANIC ROCKS. Fig. 712. 659. Fig. 713. View of the Isle of Cyclops in the Bay of Trezza.* laid open to view, are situated in the Bay of Trezza, and may be re 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 tufaceous breccias formed. Enclosed in these breccias are many angular and hardened frag
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Ch. XXX.] POST-PLIOCENE VOLCANIC ROCKS. Fig. 712. 659. Fig. 713. View of the Isle of Cyclops in the Bay of Trezza.* laid open to view, are situated in the Bay of Trezza, and may be re 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 tufaceous breccias formed. Enclosed in these breccias are many angular and hardened fragments of laminated clay in different states of alteration by heat, and intermixed with vol- canic 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 laminse of which are occasionally subdi- vided by thin arenaceous lay- ers. These strata dip to the and rest on a mass of columnar lava (see fig. 712) 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 northeastward ,'lT . , . , 1 , Contortions of strata in the largest of the ot that represented in the draw- Cyclopian islands. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lyell, Charles, Sir, 1797-1875. New York, D. Appleton and co.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
