A Geological Manual. 2. Ed., Corr. and Enlarged. - London, Treuttel and Wurtz 1832

A Geological Manual. 2. Ed., Corr. and Enlarged. - London, Treuttel and Wurtz 1832

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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. 1832 edition. Excerpt: ...with the supracretaceous rocks, on which much of the igneous mass is now based. In Central Francefamid the extinct volcanos which there constitute such a remarkable feature in the physical geography of the country, we certainly approach relative dates in some instances. Thus the volcanic mass of the Plomb du Cantal appears to have burst through, to have upset, and to have fractured the fresh-water limestones of the Cantal, which, according to Messrs. Lyell and Murchison, may be equivalent to the fresh-water deposits of the Paris basin, and to those of Hampshire and the Isle of Wight. The following is a list of organic remains obtained by them in the fresh-water rocks of the Cantal: --The rib of an animal resembling that of an Anoplotherium or a Palzzotherium; scales of a tortoise; fish teeth; Potamides Lamarckii; Limnma acuminata; L. columellaris; L. fusiformis; L. longiscata; L. inflata; L. cornea; L. Fabulum? L. strigosa? L. palustris antiqua; Bulimus Terebra; B. pygmeus? B. conicus; Planorbis rotundatus; P. Cornu, -P. rotundur; Ancylus elegans. Plants: Chara medicaginula, the seeds (gyrogonites), and stems; carbonized wood. It is remarked, that out of this short list there are eight or nine species identical with those found in the upper fresh-water rocks, and five or six with ' Boue, Journal de Geologie, t. i. 1830. those in the lower fresh-water deposits of the Paris basin '. Here we seem to obtain a relative date for the upburst of the igneous products of the Plomb du Cantal; one posterior to the deposit of the fresh-water rocks of Paris and the Isle of Wight. With regard to the relative date of the igneous rocks of Au vergne, it would appear from the labours of MM. Croizet and Jobert, that the Montagne de Perrier, N.W. from...show more

Product details

  • Paperback | 224 pages
  • 189 x 246 x 12mm | 408g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236782631
  • 9781236782632