Transactions of the Iowa State Horticultural Society for Volume 18

Transactions of the Iowa State Horticultural Society for Volume 18

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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. 1884 edition. Excerpt: ...Rock rivers. This portion of its course constitutes the pre-glacial valley of the Mississippi recognized by Warren, the abandonment of which led to the formation of the Le Claire rapids. Thus, in lts general topography eastern Iowa is characterized by a prominent escarpment near its eastern border, by a broad depression intersecting its western portion ldiagonally, and by a general southwesterly slope extending over most of its area; and more locally it is characterized by a broad shallow trough cutting ofl.' its eastern projection. And its general drainage system is almost absolutely independent of this general topography; for the principal streams not only flow at right angles to the general slope, and cut through the elevated escarpment when it lies in their way, but, with the single exception of the Cedar, they preserve their courses across the ancient valley of the Mississippi-prototype. Minor Features of Topography and Drainage.--Over. a considerable portion of eastern Iowa an extensive system of parallel ridges (the kames of the Scottish and the aasar of the Scandinavian geologists) prevails. These ridges usually rise rather abruptly from the drift-plain to a height of from ten to nearly one hundred feet, and are the more conspicuous in that they are usually wooded, while the drift is timberless. Their number, and still more their length and continuity, are remarkable. About forty are five miles or more in length, half a dozen of these are more than sixty miles long, and one or two extend, with no considerable breaks, for a hundred miles. In structure, they consist extensively of loess graduating downward into sand or ground, which either reposes upon or presses insensibly into the unmodified glacial drift of the region. The...
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Product details

  • Paperback | 236 pages
  • 189 x 246 x 13mm | 426g
  • United States
  • English
  • black & white illustrations
  • 1236913620
  • 9781236913623