Revised Text-Book of Geology

Revised Text-Book of Geology

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 edition. Excerpt: ...have exceeded 2500 F. The atmosphere must then have contained all the water of the globe, all the carbon (in the form of carbon dioxide) now stored in solid form as coal and other hydrocarbon compounds and as carbonates, and various other materials which have since formed solid compounds. When the ocean was first formed by condensation from the atmosphere, its temperature may have been as high as 500 F., the atmospheric pressure being still perhaps 30 times as great as at present. The chemical action of the ocean in rock destruction and rock formation must then have been very much more important than in later times. Long ages must have elapsed before the earth was cool enough to permit the existence of the lowest organisms. Archaean time must have been immensely long. ROCKS: KINDS AND DISTRIBUTION. 1. Distribution.--Since the Archaean era commenced with the origin of the earth's crust, Archaean rocks must extend around the globe, underlying all rocks of subsequent ages, and furnishing the material out of which most of these later rocks have been made. Over by far the larger part of the surface of the globe, they are concealed from view by subsequent formations. In North America they are surface rocks over a large area north of the Great Lakes, shaped like the letter V, the longer branch of which runs northwest to the Arctic Ocean, and the shorter northeast to Labrador. The large white area on the preceding map, in what is now British America, is the portion of the continent here referred to. Archaean rocks also appear in linear areas along the course of the mountain chains which form the borders of the continent. The longest of these areas in the east extends (though not without interruptions) from near the St. Lawrence to Georgia, ...
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Product details

  • Paperback | 140 pages
  • 189 x 246 x 8mm | 263g
  • United States
  • English
  • black & white illustrations
  • 1236830903
  • 9781236830906