Records of the Geological Survey of New South Wales (Volume 4)
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Records of the Geological Survey of New South Wales (Volume 4)

Records of the Geological Survey of New South Wales (Volume 4)


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: II.?Columnar Structure in Quartz-Felspar Porphyry at Mount Hope, Co. Blaxland, N. S. Wales: by John B. Jaquex, A.R.S.M., F.G.S., Geological Surveyor, and George W. Cabd, A.R.S.M., F.G.S., Curator and Mineralogist. About a mile distant, in a westerly direction from the South Copper-mine, in the vicinity of Mount Hope, a low hill, composed of quartz-felspar porphyry, is to be found intruding (?) clay-slates, which can be observed in some places at its base. The whole of the upper portion of the boss is marked out by joints into a system of hexagonal columnar blocks, and, in some places, owing to unequal denudation having occurred, the columns so exposed stand out above their neighbours. The greatest observed height of these columns above the general surface of the hill was six feet, while the width of the faces varies between one foot and eighteen inches. Some of them, as a result of weathering, have assumed rudely-pointed, terminations. From a description given by Mr. Cawse, General Manager of the Mount Hope Copper-mine, it would seem as if columns exhibiting a cone-in-cone structure could be seen at one time, but now every instance of this structure appears to have been effaced. During the period when the copper mines were being exploited on a large scale, and a considerable population was resident at Mount Hope, boys from this town were accustomed to resort to this hill and wedge out the columns with crowbars in order to watch them roll down its sides; the base of the hill is now strewn with the broken remains of columns sacrificed in this manner. A subsequent examination of the prominent hill which overlooks from the west the township of Mount Hope, and is distant from it about a mile and a half, showed it also to consist of the porphyritic rock, with a system of h...


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Product Details
  • ISBN-13: 9780217542623
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 88
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 021754262X
  • Publisher Date: 03 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 172 gr


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