Reports on the Geology of Jamaica Volume 2

Reports on the Geology of Jamaica Volume 2

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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. 1869 edition. Excerpt: is 12 or more feet in depth, reaching a maximum of 30 in Mile Gully district; while in other parts it is almost entirely absent, being then seen only in the cavities and surface joints of the underlaying limestone. It is distributed without regard to level, attaining sometimes its full thickness in the highest positions, while in some valleys it is extremely thin. The surface presented by this deposit consists chiefly of gently undulating ground with rounded hills, very frequently of rounded ridges joining two limestone hills. At Oldbury, Blenheim, and Allison Town blocks of red htematite of an earthy variety are scattered about. In the first-named place they occur on a rounded hill of this red earth, and are of all sizes, from a few pounds to 40 or 50 and upwards. By observing the crumbling away and disintegration of these blocks exposed to the wasting influence.of a tropical climate, the presence of a large portion of this formation can be reasonably accounted for. White Limestone. This parish may be said to be composed almost entirely of white limestone, for it is only in a few districts on its very borders that we meet with any other formation. The lithological characters of this limestone are everywhere so similar, that they can be explained in a very few words as follows: --Alternations of hard compact limestone with beds equally hard of the same composition, but of a more crystalline character; the whole interstratified with beds of soft white chalky marl. The usual colour of the limestone is white as the name implies, but it frequently occurs of greyish and dark grey colours. The marl is invariably of a fine snow white. These beds of marl, which form so considerable a portion of this formation, often show lines of..
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Product details

  • Paperback | 152 pages
  • 189 x 246 x 8mm | 286g
  • United States
  • English
  • black & white illustrations
  • 1236803337
  • 9781236803337