. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Cn. EXPERIMENTS TO ILLUSTRATE CURVED STRATA. 49 on the east coast of Scotland, where the rocks consist principally of a bluish slate, having frequently a ripple-marked surface. The undulations bi the beds reach from the top to the bottom of cliffs from 200 to 300. Curved strata of slate near St. Abb's Head, Berwickshire. (Sir J. Hall.) feet in height, and there are sixteen distinct bendinars in the course of about six miles, the curvatures being alternately conca
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Cn. EXPERIMENTS TO ILLUSTRATE CURVED STRATA. 49 on the east coast of Scotland, where the rocks consist principally of a bluish slate, having frequently a ripple-marked surface. The undulations bi the beds reach from the top to the bottom of cliffs from 200 to 300. Curved strata of slate near St. Abb's Head, Berwickshire. (Sir J. Hall.) feet in height, and there are sixteen distinct bendinars in the course of about six miles, the curvatures being alternately concave and convex up- wards. An experiment was made by Sir James Hall, with a view of illus- trating the manner in which such strata, assuming them to have been originally horizontal, may have been forced into their present position. A set of layers of clay were placed under a weight, and their opposite ends pressed towards each other with such force as to cause them to approach more nearly together. On the removal of the weight, the layers of clay were found to be curved and folded, so as to bear a miniature resemblance to the strata in the cliffs. "We must, however, bear in mind, that in the natural section or sea-cliff we only see the foldings imperfectly, one part being invisible beneath the sea, and the other, or upper portion, being- supposed to have been carried away by denudation, or that action of Fig. 64. 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
