Excerpt from Mineral Zonation of Woodfordian Loesses of Illinois<br/><br/>Three-fourths of the surface of Illinois is underlain by loess that commonly ranges from a few feet to more than 50 feet in thickness. It rests on both glacially derived deposits and on bedrock, and because of its position just below the surface, it is important in construction projects, as fill material, as the parent material for much of the state' s soil, and locally for such uses as ceramic raw material. The Illinois State Geological Survey has studied the stratigraphy and mineral comp051 tion of the surficial loesses (frye, Glass, and Willman, 1962; Frye and Willman, 1963; Glass, Frye, and Willman, and this report gives the results of stud ies of the mineralogical zonation of the younge st, or uppermost, loess units.
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