Distribution and Movements of Desert Plants

Distribution and Movements of Desert Plants

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1909 edition. Excerpt: ...It does not seem probable, therefore, that theoretical analysis of the complex relations that obtain between climate and deposition will accomplish what it has in the case of deposition by running water or by glacial action. The problem will be solved by detailed studies in each region. In each case the disturbing factors must be evaluated and the intensity of each process gaged.1 One of the most inviting fields for such a study is the "bolson" or undrained area developed under conditions of aridity. The typical bolson2 is an expression of aggradational processes and is excellently portrayed in the smaller undrained flats of southwestern Arizona. An idealized section through a bolson is attempted in figure 3. The angle A represents the slope of the top of the mountain chain or peak. This upper surface is often parallel to the rock structure and is therefore flat or sloping as the strata are horizontal or inclined. The higher mountains reach up into a region of forests and abundant grasses which protect the surface and preserve the flat top. The angle B is the slope developed by the attack of torrential precipitation upon the rock struc 'Since writing the above I have received the Journal of Geology, XVI, No. 2, which contains the first installment of an article under the title "Relation between climate and terrestrial deposits," which is to be continued in Nos. 3 and 4. It appears that Professor Barrell has not been deterred by the difficulties inherent in any general analysis of the relations between climate and deposition. The portion published indicates clearly the great value of his contribution, and the completion of his article is awaited with impatience. Hill, R. T.: Topog. Atlas of the U. S., Folio 3, U. S. G. S., ...show more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236524896
  • 9781236524898