The British Colonial Library Volume 1

The British Colonial Library Volume 1

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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. 1838 edition. Excerpt: ...(all silicious except the last two), with iron, lead and copper are found imbedded in it. The sand hills west of the Grand Marais, present to the lake, for nine miles, a steep acclivity 300 feet high, composed of light yellow silicious sand, in three layers 150, 80, and 70 feet thick; the last mentioned uppermost, and like the lowest, pure, while the middle bed has many pebbles of granite, limestone, hornblende, and quartz. By the subsidence of the waters of Lakes Superior and Huron, occasioned, Mr. Lyell thinks, by the partial destruction of their barriers at some unknown period, beds of sand, 150 feet thick, are exposed; below which are seen beds of clay, enclosing shells of the very species which now inhabit the lakes. Dr. Bigsby, who minutely examined Lake Superior, observed, that a red sandstone for the most part horizontal, predominates on the south shore, resting in places on granite. Amygdaloid occupies a very large tract in the north, stretching from Cape Verd to the Grand Portage, profusely intermingled with argillaceous and other porphyries, sienite, trapposegreenstone, sandstone, and conglomerates. Trapposegreenstone is the prevailing rock from Thunder Mountain westward, and gives rise to the pilastered precipices in the vicinity of Fort William. Part of the north and east shore is the seat of older formations, viz. sienite, stratified greenstone, more or less chloritic, and alternating five times with vast beds of granite, the general direction east, with a north or perpendicular dip. Great quantities of the older shell limestone are found strewn in rolled masses on the beach, from Point Marmoaze to Grand Portage; its organic remains are trilobites, orthoceratites, enerinites, products, madrepores, terebratula?, &c. At Michipicoton...
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Product details

  • Paperback | 96 pages
  • 189 x 246 x 5mm | 186g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236656687
  • 9781236656681