. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. 279 BASALTIC ROCKS. rising in perpendicular height from 20 to 400 feet and below the cascades it passes through a mount- ain of the same more than 1000 feet high, and nearly vertical. Extensive basaltic dikes exist in Essex county, in the northern part of the State of Nev^-York, which pursue an easterly and westerly course to a great distance. At Avalanche Lake, a dike eighty feel wide cuts through Mount M'Martin nearly in its centre.
. The elements of geology, for popular use : containing a description of the geological formations and mineral resources of the United States. Geology; Geology. 279 BASALTIC ROCKS. rising in perpendicular height from 20 to 400 feet and below the cascades it passes through a mount- ain of the same more than 1000 feet high, and nearly vertical. Extensive basaltic dikes exist in Essex county, in the northern part of the State of Nev^-York, which pursue an easterly and westerly course to a great distance. At Avalanche Lake, a dike eighty feel wide cuts through Mount M'Martin nearly in its centre. Here we perceive on a large scale the effects of frost and water in breaking up the solid crust of the globe ; there being numerous masses of rocks, from 50 to 100 feet long, broken up from their original beds, and carried partly down the de- clivity, constituting a mass of ruins from the base to the summit, which the rains and frost are con- stantly reducing to smaller tnasses, and urging them onward to mingle with the soil in the plain below. What are called the natural walls of North Caro- lina are basaltic dikes, formed of columnar or pris- matic masses, fitting close to each other, and lying with their lengths across the wall, and showing their ends on its sides as in the following Basaltic Dike. A trap formation, about three miles in breadth, extends along the Bay of Fundy, in Nova Scotia, a distance of 130 miles. It rises into stupendous precipices, and exhibits basaltic and greenstone col- umns 300 or 400 feet high, against which the waves and tides beat. This range affords a very great abundance of beautiful minerals, such as amethyst, rock crystal, chalcedony, agate, specular iron ore, Sic. 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 Lee, Charles A. (Charles Alfred), 1801-1872. New-Yor
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1846
