Weathered Zones of the Drift-Sheets of Illinois

摘要: A study of the weathered zones various drift-sheets Illinois reveals that they consistently comprise four subdivisions, regardless topographic or vegetative environment, but nevertheless show characteristic responses to position and drainage conditions. In well-drained areas silttil profile has developed, in poorly drained gumbotil partially mesotil developed. The Wisconsin Iowan immature profiles Illinoian older show, respectively, early-mature mature profiles. It seems probable one area may be correlated with another area. where erosion worked headward into a broad flat area, weathering its upper portion beginning second due newer better "Fossil" buried beneath ...