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Updated: May 22, 2025
Now such joints are supposed to be analogous to the partings which separate volcanic and Plutonic rocks into cuboidal and prismatic masses. On a small scale we see clay and starch when dry split into similar shapes; this is often caused by simple contraction, whether the shrinking be due to the evaporation of water, or to a change of temperature.
I saw nothing beyond a succession of ridge-backs and shrinkage-crevasses, disposed upon an acute angle. These ragged, angular, and mostly cuboidal blocks, resembling the ice-pack of St. Lawrence River, have apparently been borne down by subsequent lava-currents, which, however, lacked impetus to reach the lower levels of Las Canadas.
Gone are the fleet legs, great head, bulky snout, terrible jaws, warlike tusks, open nostrils, flapping ears, gaunt flanks, and racing sides; and with these has gone everything that told of strength, freedom, and wild life. In their place has come a cuboidal mass, twice as long as it is broad or high, with a place in front for mouth and eyes, and a foolish-looking leg under each corner.
Some of the larger flat-bottomed valleys are irrigated by aqueducts from the river.... The peaks, tors, and logging-stones of Bijanugger and Annegundi indent the horizon in picturesque confusion, and are scarcely to be distinguished from the more artificial ruins of the ancient metropolis of the Deccan, which are usually constructed with blocks quarried from their sides, and vie in grotesqueness of outline and massiveness of character with the alternate airiness and solidity exhibited by nature in the nicely-poised logging stones and columnar piles, and in the walls of prodigious cuboidal blocks of granite which often crest and top her massive domes and ridges in natural cyclopean masonry."
Although it is the general peculiarity of granite to assume no definite shapes, it is nevertheless occasionally subdivided by fissures, so as to assume a cuboidal, and even a columnar, structure. Examples of these appearances may be seen near the Land's End, in Cornwall. Graphic granite. Graphic granite. Graphic granite.
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