Bulletin of the Geological Society of America Volume 13

Bulletin of the Geological Society of America Volume 13

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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. 1902 edition. Excerpt: ... of the high summits were ever submerged beneath a general icesheet, although glaciers accumulated to great depth in the valleys. The spurs which extend from the crest northeasterly have summit characters resembling those of the crest in its immediate vicinity and sometimes to a distance of several miles away from it. Differences of elevation along the crest of the Lewis range are scarcely less pronounced than they are across it. Its rugged backbone is accentuated by high peaks between which are deep U-shaped wind gaps. The elevations of the highest summits range from 8,500 to 10.400, and those of the wind gaps from 5,500 to 6,500. Many small glaciers still linger in the shadows of the high peaks, and the Harrison and Blackfoot glaciers are nearly continuous for 5J miles along the summit between Harrison creek and Saint Mary river. Water tan-McDonald valley.--West of the Lewis crest and between it and the Livingston crest lies the central valley of the Front range. It has the trend common to all the major features, north 10 to 20 degrees west, and is drained by two streams, one of which, Waterton river and its head tributaries, flows north, the other, the McDonald lake drainage, flowing south and southwesterly. The divide between these streams is known as Flattop mountain, but should not be confused with the Flattop mountain east of the Lewis range. It has an elevation of about 6,800 feet, and is a broad expanse of slight relief, which was in fact the floor of an older valley under a previous condition of drainage lines. The head of Waterton river, Little Kootna creek, lies in a canyon 3,000 feet deep, across the northern end of Flattop mountain, and Mineral and McDonald creeks, which unite to flow to McDonald lake, lie respectively on...show more

Product details

  • Paperback | 254 pages
  • 189 x 246 x 13mm | 458g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236817893
  • 9781236817891