Principles of Geology : Being An Inquiry How Far the Former Changes of the Earth's Surface Are Referable to Causes Now in Operation 2
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Mont Dor and the Plomb du Cantal, indeed, differ in many respects from Vesuvius and Etna in the mineral constitu- tion and structure of their lavas ; but it is that kind of difference which we must expect to discover when we compare the products of any two active volcanos in distant regions, such as TenerifTe and Hecla, or Hecla and Cotopaxi.
The Amygdaloidal structure in many of the trap formations proves that they were originally cellular and porous, like lava ; but the cells have been subseq...uently filled up with silex, carbonate of lime, zeolite, and other ingredients which form the nodules. The absence of this amygdaloidal structure may be said to be one of the negative characters of granite and other plutonic rocks.
Dr. MacCuUoch, after examining with great attention the igneous rocks of Scotland, observes, " that it is a mere dispute about terms to refuse to the ancient eruptions of trap the name of submarine volcanos, for they are such in every essential point, although they no longer eject fire and smoke."* The same author also considers it not improbable that some of the volcanic rocks of the same country may have been poured out in the open air.t The recent examination of the igneous rocks of Sicily, especially those of the Val di Noto, has proved that all the more ordinary varieties of European trap have been produced under the waters of the sea in the Newer Pliocene period; that is to say, since the Mediterranean has been inhabited by a great proportion of the existing species of testacea.
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You can find similar books in the "Read Also" column, or choose other free books by Lyell, Charles, Sir, 1797-1875 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Mont Dor and the Plomb du Cantal, indeed, differ in many respects from Vesuvius and Etna in the mineral constitu- tion and structure of their lavas ; but it is that kind of difference which we must expect to discover when we compare the products of any two active volcanos in distant regions, such as TenerifTe and Hecla, or Hecla and Cotopaxi.
The Amygdaloidal structure in many of the trap formations proves that they were originally cellular and porous, like lava ; but the cells have been subseq...uently filled up with silex, carbonate of lime, zeolite, and other ingredients which form the nodules. The absence of this amygdaloidal structure may be said to be one of the negative characters of granite and other plutonic rocks.
Dr. MacCuUoch, after examining with great attention the igneous rocks of Scotland, observes, " that it is a mere dispute about terms to refuse to the ancient eruptions of trap the name of submarine volcanos, for they are such in every essential point, although they no longer eject fire and smoke."* The same author also considers it not improbable that some of the volcanic rocks of the same country may have been poured out in the open air.t The recent examination of the igneous rocks of Sicily, especially those of the Val di Noto, has proved that all the more ordinary varieties of European trap have been produced under the waters of the sea in the Newer Pliocene period; that is to say, since the Mediterranean has been inhabited by a great proportion of the existing species of testacea.
What to read after Principles of Geology : Being An Inquiry How Far the Former Changes of the Earth's Surface Are Referable to Causes Now in Operation 2?
You can find similar books in the "Read Also" column, or choose other free books by Lyell, Charles, Sir, 1797-1875 to read onlineMoreLess
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