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Updated: June 20, 2025
Almost all the volcanoes which preserve any remains of their original form, or from the craters of which lava streams can be traced, are more modern than the Eocene fauna now under consideration; and besides these superficial monuments of the action of heat, Plutonic influences have worked vast changes in the texture of rocks within the same period.
He writes him from the neighborhood of Bex, his home in the valley of the Rhone, the classic land of glacial work; but he writes of Agassiz's special subjects, inviting him to come and see such fossils as were to be found in his neighborhood, and to investigate certain phenomena of upheaval and of plutonic action in the same region, little dreaming that the young zoologist was presently to join him in his own chosen field of research.
I think the present disputes upon this subject will end somewhat like those which divided the Neptunic and Plutonic schools of geologists in the early part of this century; the former of whom would have it that all the rocks were due to the action of water, the latter that they were wholly due to the action of fire.
The further study of these subordinate periods showed that what had been called Primary formations, namely, the volcanic or Plutonic rocks formerly believed to be confined to the first geological ages, belonged to all the periods, successive eruptions having taken place at all times, pouring up through the accumulated deposits, penetrating and injecting their cracks, fissures, and inequalities, as well as throwing out large masses on the surface.
Now they curve from north-east to south-west in a kind of scorpion's tail, with detached vertebrae torn and wasted by the adjacent plutonic outcrops; and looking from the west they suggest blood-red islets rising above the great gloomy waves of trap and porphyry.
The Rhine maidens have complained to him of Alberic's theft of their gold; and he mentions it as a curious exception to his universal law of the unpurchasable preciousness of love, that this gold-robber has forsworn love for the sake of the fabulous riches of the Plutonic empire and the mastery of the world through its power. No sooner is the tale told than the giants stoop lower than the dwarf.
Great upheaving movements have been experienced in the region of the Andes, during the Post-tertiary period. In some part, therefore, of this chain, we may expect to discover tertiary Plutonic rocks laid open to view; and Mr.
These dolerites are cut through by intrusive syenite, and this syenite, in its turn, is again cut and penetrated by feldspar porphyry, the base of which consists of petrosilex, or a mixture of orthoclase and quartz. All these trap- rocks appear to be of Laurentian date, as the Cambrian and Huronian rocks rest unconformably upon them. General Aspect of Plutonic Rocks. Granite and its Varieties.
To this, on its southern limit, succeeds a region equally extensive of syenite, the passage from the trappean to the crystalline Plutonic rock being so gradual that it is impossible to draw a line of demarkation between them. "The ordinary granite of Aberdeenshire," says Dr.
The great boulder had known changes since the old Plutonic forces cast it upwards, a mere bubble of melted red granite, solidifying as it went into a stone acorn thirty feet high, which the glacier brought down in a slow journey of countless ages, and set upright like a phallic symbol, amongst other boulders of lesser size.
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