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Updated: June 24, 2025
Intrusive sheets fed by the dikes penetrate the surrounding strata, and their edges are cut by canyons as much as twenty-five miles from the mountain. In these strata are valuable beds of lignite, an imperfect coal, which the heat of dikes and sheets has changed to coke. The HENRY MOUNTAINS, a small group of detached peaks in southern Utah, rise from a plateau of horizontal rocks.
From his purpose he was for a time diverted by the attitude of his rebellious subjects in Belgium. Maddened to ferocity by the failure of his plans, he devoted the whole people to destruction, and he sent his best-equipped armies, under the terrible Duke of Alva, to devastate the cities of the dikes as Pizarro had destroyed the homes of the Incas.
The gorge through which he had descended debouched by a hillock that rose from the valley-plain; a small newly-built church leaned against its eastern declivity, and it was fortified on all sides by walls and dikes, behind which the citizens found shelter when they were threatened by the Saracen robbers of the oasis. This hill passed for a particularly sacred spot.
The hypothesis that dikes are driven upward into strata by the pressure of the beds which overlie materials hot and soft enough to be put in motion when a fissure enters them, and that their movement upward through the crevice is accounted for by this pressure, makes certain features of these intrusions comprehensible.
The arms have sails on them to catch the wind. It is the wind that makes the arms go round. With these windmills the people pump up water, and grind corn, and saw wood. The land is very flat and low. There are no swift running streams to turn the mills. So the people build windmills. The great wonder of Holland is the dikes.
We ought not, however, to suppose, in hardly any instance, that the whole body of matter, forming a volcanic island, has been erupted at the level, on which it now stands: the number of dikes, which seem invariably to intersect the interior parts of every volcano, show, on the principles explained by M. Elie de Beaumont, that the whole mass has been uplifted and fissured.
He paused, and then repeated, "Yes ma'am." She looked at him for a moment. "But you will do some work, too, won't you?" she asked slowly. Her intention in this passed by Alonzo at the time. "Yes ma'am," he answered. "The committee work interests me greatly, especially drains and dikes."
The pebbles in these conglomerates are sometimes composed of granitic and quartzose rocks, sometimes exclusively of different varieties of trap, which last, although purposely omitted in the section referred to, is often found either intruding itself in amorphous masses and dikes into the old fossiliferous tilestones, No. 4, or alternating with them in conformable beds.
I have commenced this chapter with a description of the dikes and other hydraulic works of the Netherland engineers, because both the immediate and the remote results of such operations are more obvious and more easily measured, though certainly not more important, than those of much older and more widely diffused modes of resisting or directing the flow of waters, which have been practised from remote antiquity in the interior of all civilized countries.
Megabyzus ordered the channel to be drained by dikes, and the vessels, the main force of the Athenians, were left stranded. Terrified by this dexterous manoeuvre, as well as by the success of the Persians, the Egyptians renounced all further resistance; and the Athenians were deprived at once of their vessels and their allies.
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