. Elements of geology : a text-book for colleges and for the general reader. Geology. New South Wales (Dana). closely fitting together, varying in size from a few inches to a foot or more, and in length from several feet to fifty or one hundred feet. When these columns have been well exposed on cliffs by the action of waves, or on river-banks by the erosive action of currents, or even by atmospheric disintegration, they produce a very striking scenic effect (Figs. 187, 188). In Europe the Giant's Causeway, on the coast of Ireland, and Fingal's Cave, in the island of StafTa on the west coast of
. Elements of geology : a text-book for colleges and for the general reader. Geology. New South Wales (Dana). closely fitting together, varying in size from a few inches to a foot or more, and in length from several feet to fifty or one hundred feet. When these columns have been well exposed on cliffs by the action of waves, or on river-banks by the erosive action of currents, or even by atmospheric disintegration, they produce a very striking scenic effect (Figs. 187, 188). In Europe the Giant's Causeway, on the coast of Ireland, and Fingal's Cave, in the island of StafTa on the west coast of. Fig. 188.—Basaltic Columns on Sedimentary Rock, Lake Snperior (after Owen). Scotland, are conspicuous examples. In the United States we have ex- amples in Mount Holyoke, on the Connecticut River; in the Palisades of the Hudson River; in the traps on the shores of Lake Superior; and especially in splendid cliffs of the Columbia and Deschutes Rivers, in Oregon. Direction of the Columns.—The direction of the columns is usually at right angles to the cooling surface. In horizontal sheets, therefore, the columns are vertical, but in dikes they are horizontal (Fig. 189). A dike left standing above the general surface of country sometimes. 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
