An Outline of the Geology of Canada; Based on a Subdivision of the Provinces Into Natural Areas

An Outline of the Geology of Canada; Based on a Subdivision of the Provinces Into Natural Areas

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1876 edition. Excerpt: ...of Huronian rock, occur likewise in many places; and glacial strise and furrows are seen on almost all the exposed rocksurfaces. The stria? have a general south-westerly direction, but vary from a few degrees west of south to about S. 50 W. Petroleum springs occur both on the Great Manitoulin and on some of the other islands of the Manitoulin group. The petroleum appears to come from the Utica shales; but although the formation has been penetrated and even traversed by several wells or borings, no permanent supply has hitherto been obtained. (6.) Tlie District of the Upper Lakes.--This region may be described in general terms as extending over the entire north-western portion of Ontario, from Lake Temiscamang and French Iiiver, on Lake Huron, to the boundary of the Province beyond Lake Superior. It foims for the greater part a densely wooded but rugged and mountainous region, broken up by numerous bodies of water, and undeilaid throughout its area generally by hard crystalline rocks of the Laurentian series. The surface of Lake Huron is 578 feet, and that of Lake Superior 600 feet above the sea. From these levels the ground rises more or less abruptly to an average height of from 1,000 to 1,500 feet, with occasional points of still greater elevation. The recognized rock formations comprise representatives of the Laurentian, Huronian, Upper Copper-Bearing, and Chazy (1) series, with many eruptive Granitic and Trappean rocks, and overlying Glacial and Post-Glacial deposits. The Laurentian rocks are composed of vast beds of micaceous and hornblendic gneiss, quartzites, and other crystalline strata; but bands of crystalline limestone, so commonly associated with fhese rocks in eastern districts, are here apparently wanting. These Laurentian strata...show more

Product details

  • Paperback | 48 pages
  • 189 x 246 x 3mm | 104g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236530233
  • 9781236530233