. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. 368 ISLANDS IN THE EOCENE SEA. Fig. 364. [ XIX Z-r-'X. Section showing that the Weald had been denuded of chalk before the Lower Eocene strata were deposited. S. Eelative position of Saffron "Walden. G. Chalk-escarpment above Godstone, surmounted by a patch of the Lower Tertiary beds, &'. a. London Clay. &, &'. Lower Tertiaries. " c. Chalk. d. Upper Greensand. e. Gault. / Lower Greensand and Wealden. x. Point at which the present upper and u
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. 368 ISLANDS IN THE EOCENE SEA. Fig. 364. [ XIX Z-r-'X. Section showing that the Weald had been denuded of chalk before the Lower Eocene strata were deposited. S. Eelative position of Saffron "Walden. G. Chalk-escarpment above Godstone, surmounted by a patch of the Lower Tertiary beds, &'. a. London Clay. &, &'. Lower Tertiaries. " c. Chalk. d. Upper Greensand. e. Gault. / Lower Greensand and Wealden. x. Point at which the present upper and under surfaces of the chalk, if they were prolonged would converge. It is therefore inferred, that, if we prolong southwards the upper and under surfaces of the chalk, along the dotted line in the above section, they would converge at the point x; therefore, beyond that point, no white chalk existed at the time when the Eocene beds, 6, &', were formed. In other words, the central parts of the Wealden, south of a?, were already bared of their original covering of chalk, or had only some slight patches of that rock scattered over them. The island, or islands, in the Eocene sea may be represented in the annexed diagram (fig. 365); but doubtless the denudation extended Fig. 3G5. Sea. 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
