Bulletin Engineering Experiment Station Volume 45-54

Bulletin Engineering Experiment Station Volume 45-54

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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. 1916 edition. Excerpt: ...the Iowan Drift Area now exposed covers an area Just east of soil area No. 1. The Iowan Drift Area comprises all or part _0f 29 Counties. This area is nearer maturity than the I/Visconsin Drift Area and has more complete natural drainage, as is evidenced by 'l11@ absence of ponds and sloughs, and by the deeper and more pron011f1CB(1 natural water courses. The soil of the Iowan Drift area is much the same as that of the VVisconsin. The top soil is generally a black loam, sometimes sa1ilY or gravelly, while the underlying strata are sand, sandy clay 01' C13)'Some sections of this area have a substratum of sand or gravel at a depth of four to six feet which often is a great aid to tinderdrainagthough this layer is quite often overlain with a layer of clay or sand)' clay 6 inches to 18 inches in thickness. Practically no peat and but very few "alkali spots" are found in this area. (3)_ Svllfhern Iowa Loess and Kansas Drift Area. This area is Shown in Fig 1 as the Southern Iowa Loess Area, and includes practically all of the state south of the VVisconsin and Iowan Drift Areasbetween the Missouri and Mississippi Loess Areas. The subsoil f0Y' mation is of the till from the great Kansan Ice-sheet which covered Iowa long before either of the other ice-sheets mentioned. At a l 1'f?T time the deposit known as the Iowa Loess was placed over this dep0S1i of till. This area is much older than either of the other drift areas and has numerous well defined natural drainage channels, though many nearly flat areas of both bottom land and upland now exist. The top soil of this area is the loess deposit and may be described as a fine black loam. It is usually found now only on the dividfifii erosion having removed it from...show more

Product details

  • Paperback | 106 pages
  • 189 x 246 x 6mm | 204g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236835484
  • 9781236835482