The Story of the Earth in Past Ages

The Story of the Earth in Past Ages

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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. 1896 edition. Excerpt: ...Fermetus, which are so important in the sea-shore life of the present day. They are associated with two very interesting Cephalopods. Nautilus occurs accompanied by the remarkable Nautiloid shell named Clymenia, which has a fold in each septum which divides one chamber from another, similar to the fold which is observed in the septa of many tertiary species of Nautilus, which are similarly compressed from side to side. Those compressed tertiary species have the little tube named the siphuncle which passes through the septa placed in a more inward position than is usual in Nautilus. This genus Clymenia has the siphuncle as far inward as it could be, so as to be in contact with the previously formed coil. The genus is therefore in marked contrast to another remarkable fossil named Goniatites, in which the septa are angularly folded several times, and the siphuncle is as far outward as it can be. Goniatites is the antecedent form of the great group of Cephalopod shells allied to Ammonites which is found in the Secondary strata. On turning landward to the lacustrine deposits of Old Red Sandstone age, the first of the great lakes in the British area on which the old red sand-stone was deposited, is that which extends from Coalbrookdale southward over Hereford and Monmouth, and westward into Pembrokeshire. The sandstone accumulated in it is estimated to be about 8000 feet thick in Hereford and Brecon; and in Monmouth it includes thick conglomerates, full of quartz pebbles, which may be compared with those which formed the Millstone Grit, in a later period of time. The lower part of this area of tlie Old Red Sandstone is termed the cornstone group. As might be expected there is an overlap of these beds upon the Upper Cambrian, which is well more

Product details

  • Paperback | 46 pages
  • 189 x 246 x 3mm | 100g
  • United States
  • English
  • black & white illustrations
  • 1236668405
  • 9781236668400