. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Ch. XXIX.] STRUCTURE OF VOLCANIC ROCKS. Fig. 690. 619. 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