Transactions of the Geological Society of South Africa Volume 3, Nos. 1-11

Transactions of the Geological Society of South Africa Volume 3, Nos. 1-11

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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. 1898 edition. Excerpt: ...this tpye of weathering are to he found associated with masses of irregular shapes. If one examines these igneous rocks where they occur in masses, it will be seen that they preserve their rough collumnar structure so typical a feature of Dolerite cooling. The specimens exhibited by Professor Prister at the last meeting hardly point to glaciation, the angles are too sharp and their general appearance more like that caused by shearing in a disturbed area of the strata. On this point Sir Archibald Giekie, in his 3rd edition, page 1033, says of glaciated rocks " the stones are usually oblong, have one or more flat sides or ' soles, ' are smoothed or polished, and have their edges worn round. When they consist of a fine grained enduring Took, they are almost invarably striated." Amongst the professor's collection the oblong form is absent. A review of the past and present flora and fauna, as an argument bearing on the theory of a glacial period in quarternary times in South Africa, may not be without interest The present forms of plants and animals do not point to a recent age of ice, .on the contrary, it would appear as if there had been a warm.climate from Cretaceous times. Had there been a glacial period Tecently of such magnitude as supposed by Prof. Prister, surely we would have species of plants surviving on the mountains, with Arctic affinities, but, so far as I am aware, these are absent The intense cold, which reigned at the time, would have shown its.effect on the present flora and fauna. To deal thoroughly with this aspect of the question, it will be necessary to consider the animal remains found in the Kromdraai Caves in the Dolomite near Krugersdorp. Amongst these are those of the horse species, antelopes, monkeys, ...show more

Product details

  • Paperback | 48 pages
  • 189 x 246 x 3mm | 104g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236954343
  • 9781236954343