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Updated: June 2, 2025
Thick intrusive sheets have also been driven in among the strata, as, for example, the sheet of the Palisades of the Hudson, described on page 269. Were the beds laid in their present attitude? What was the nature of the deformation which they have suffered? When did the intrusion of lava sheets take place relative to the deformation?
A sure mark by which to discriminate accidental pressure of this sort from one intentionally produced is not at hand; it may be that in accidental deformation oblique position of the deformed spot is more frequent; at any rate, the difference in the Philippines is a very striking one, since there not so much the occiput as the front and middle portions suffer from the disfigurements, and thereby deformations are produced that have had their most perfect expression among the ancient Peruvians and other American tribes.
Prichard, on the difference of stature among the Polynesians; on the connection between the breadth of the skull in the Mongolians and the perfection of their senses; on the capacity of British skulls of different ages; on the flattened heads of the Colombian savages; on Siamese notions of beauty; on the beardlessness of the Siamese; on the deformation of the head among American tribes and the natives of Arakhan.
DISTRIBUTION OF EARTHQUAKES. Every half hour some considerable area of the earth's surface is sensibly shaken by an earthquake, but earthquakes are by no means uniformly distributed over the globe. As we might infer from what we know as to their causes, earthquakes are most frequent in regions now undergoing deformation.
The complex and disorderly structures of the Piedmont rocks are those seen in great mountain ranges, and there is every reason to believe that these rocks after their deformation rose to mountain height.
Although Theophilus is on the whole the deepest crater we can see in the moon, it has received little or no deformation by secondary eruptions." But perhaps the most remarkable object on the whole hemisphere of the moon is "the majestic Tycho," which rises from the surface near the south pole, and at a distance of about 1/6th of the diameter of the sphere from its margin.
For a standard with ends has been substituted a standard with marks, which permits much more precise definition and can be employed in optical processes of observation alone; that is, in processes which can produce in it no deformation and no alteration.
In eastern Pennsylvania seams of bituminous coal were altered to anthracite, while outside the region of strong deformation, as in western Pennyslvania, they remained unchanged. An important factor in the deformation was the massive limestones of the Cambrian-Ordovician. Because of these thick, resistant beds the rocks were bent into wide folds and sheared in places with great thrust faults.
In regions undergoing deformation rocks lying deep below the ground are often broken and the fissures are filled with molten rock from beneath, which finds no outlet to the surface. Such dikes are common in areas of the most ancient rocks, which have been brought to light by long erosion. In exceptional cases dikes may reach the length of fifty or one hundred miles.
But short-comings of language, which finally seemed not to detract from a definite inheritance of good breeding, touched his personality as a physical deformation might, adding to it certainly no charm, yet from its pathological aspect not without a species of fascination, for a certain order of misregulated mind. She bore with him, and then she liked him.
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