Reports Volume 7, Pts. 1-3

Reports Volume 7, Pts. 1-3

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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. 1900 edition. Excerpt: ...terrace or recent epoch. A temporary halt in the subsidence of Lake Warren seems to be indicated at about 725 feet above tide, after which the lake seems to have sunk more rapidly than before down to about 700 feet above tide. Then the subsidence must have been slower and sand ridges are numerous down to 680 feet above tide. It must have been held at this general level for quite a while, for we find in front of the 680 foot beach line that the drift has been scoured away in many places down nearly to the rock, so that the 670 foot to 690 foot contours are crowded together and a series of terrace benches have been cut on the east side of Robinson's hill on Sec. 13, Dwight. Sand ridges at about this level, i. e. 98-108 feet above the lake were found almost invariably where these contours were crossed, also delta sands near the rivers on both sides of the county. Most of the outcrops, except those immediately adjacent to the shore, are connected with this level. Frequently there are numerous boulders covering the surface of the lower land immediately to the west like the boulder pavement figured by Spencer.f The sand ridges are, however, so near together in altitude that they are within the range of our errors In determining altitude, so that nothing can be said very definitely. Still In LincoIn numerous ridges fall within 145 to 134 feet above lake, in Meade within 153 to 133, In Colfax within 152 to 144 and one at 128 feet. In the north part of Grant the soil is sandy about 150 to 130 feet above lake, and in the south part of the township it is gravelly pretty continuously down to 125 feet above the lake; these facts may be accounted for by supposing that the upward grade toward the ice had largely disappeared before the lake had sunk more than...
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Product details

  • Paperback | 260 pages
  • 189 x 246 x 14mm | 472g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236614216
  • 9781236614216