Sessional Papers of the Legislative Assembly of the Province of Ontario Volume 37, No. 2

Sessional Papers of the Legislative Assembly of the Province of Ontario Volume 37, No. 2

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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. 1905 edition. Excerpt: ... in the second concession of Bucke. daries accurately, and in tl1is connection it may be said that if the slaty phases of the Lower Huronian have been metamorphosed, as they sometimes are in the vi.inity of (liabase intrusions, it becomes doubly diflicult to distinguish them from the Keewatim Ve have also shown Keewatin areas along the Montreal river between Hound Chute and Sandy portage. This area is probably much larger than shown on the map, as no attempt was made to trace it out in detail. Similar rocks are found around lake New Contact of Keewatin and Laurentian Although the Laurentian granite covers an area of considerable extent on the map, we found only one good contact where the granite plays the part of an intrusive rock. This was near the northwest corner of what we have called Kirk lake. The granite here comes in contact with greenstone and sends out small dikes and stringers into it. This greenstone appears to be a variety of the Keewatin of the district. It is certainly older than the granite. A microscopic axamination of the greenstone was not very satisfactory owing to the metamorphism to which it has been subjected. The granite of the district is commonly rather coarse in grain and of a deep fleshred color, the feldparpredominating. The ferro-magnesian constituent is biotite, which is usually converted to chlorite and occurs in small quantity. The predominant feldspar is generally microcline and other acid varieties of plagioclase are abundant. The larger quartz grains frequently show a rounded outline. It would have been a source of satisfaction if we had been able to find more contacts of the granite with the Keewatin greenstones, but the writer thinks that the relationship which is shown by the legend on the map to...
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Product details

  • Paperback | 452 pages
  • 189 x 246 x 23mm | 803g
  • United States
  • English
  • black & white illustrations
  • 1236833112
  • 9781236833112