Inhaltsangabe
This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1829. Not illustrated. Excerpt: ... Granite; its varieties and aspects.--Gneiss.--Mica-slate.--Syenite--Porphyry Marble.--Serpentine.--Quartz Rock.--Granite Tors.--Decomposing Granite.--Association of Rocks in Glentilt.--Theories.--Rocks at the Fall of Fyers. We have now arrived at the primitive formations of the Wernerians, at those strata, or rocks, upon which all others appear to rest, and which, towering up through the superincumbent substances, form the exposed peaks and loftiest summits of the principal mountain-chains of the world. Whether these rocks The highest mountains in Britain are composed of granite and its associates; but these are mere trifling protuberances upon the earth's face, when compared with the exceeding heights of the Alpine chain, or the yet more elevated mountains of South America, and of the Sect. VII. GRANITIC ROCKS. 127 are to be regarded as original formations, upon which the other stratified materials have been successively deposited in that order of arrangement which we have enumerated; or whether the stratified rocks are to be considered, with the Huttonians, as primary, and the granitic and other masses that we are about to examine, as having been subsequently elevated by the expansive force of subterraneous heat, are questions that have eagerly engaged the contending geological schools, and to which too much importance has often been assigned. As we proceed in the examination of these substances, we shall notice such of their characters as have especially given rise to the igneous and Asiatic continent, which consist of the same materials. Ben Nevis, the loftiest of the British mountains, is situated in the south of Invernessshire, and is four thousand three hundred and seventy feet high. Cairngorm, in the same county, is four thousand and fifty feet high. Mo...
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