A First Book of Geology

A First 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. 1914 edition. Excerpt: ...the newer rocks more especially. In addition to the actual hard parts of organisms and casts or moulds of those hard parts, impressions are often found. These are also known as fossils by the geologist. They are best Fm. 37.---SECTlON oF THE s.-um: CORAL AS IN FIG. 36, SHOWING INTERNAL STRUCTURES. seen and are most common in fine-grained sandstones and shales. The footprints of birds and reptiles and mammals may be seen in some of the sandstones where other fossils are very scarce indeed. Examples of these interesting fossils are to be seen in many of our great museums. Of the same kind of fossils are the worm-tracks, and the trails of shellfish which are often well preserved in sandstones and shales. Delicate shells, which are themselves seldom preserved, have often left their impressions in the hardened, finely stratified muds which now form shales, and every detail of external structure may often be seen. This is equally true of FIG. 38.--FossIL FERN. Com. MEASURES OF SOUTHERN BELGIUM. Photo. G. Schmitz, S.. By the courtesy of Dr. A. Renier, Director of the Geological Survey of Belgium. many delicate leaves of plants, and fronds of ferns. These were carried down into the sea or estuary where the finegrained deposit was being formed. On settling down in the soft mud, a stamp or die of the fern or other leaf was formed. The leaf would be covered up by the next deposit of material. When it was afterwards dissolved away after decay, there would be left an impression of the external characters of the leaf. Such fossils are often of very great beauty. The shales associated with the coal-seams of our Coal Measures abound in them. A very beautiful example is seen in Fig. 38 which represents a fossil fern-like plant from the shales of the Coal...
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Product details

  • Paperback | 34 pages
  • 189 x 246 x 2mm | 82g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236768302
  • 9781236768308