Water Supply and Irrigation Papers of the United States Geological Survey . f Tertiaryage, consisting mainly of clay, micaceous sand, and a ferruginous,pebbly conglomerate. , These deposits are probably separated from theCretaceous by an interval of some consequence, and are known to beseparated from the next later formation developed in Illinois, the Pleis-tocene, by a wide interval. In the table on page 249 the several driftsheets of the Pleistocene are presented because these divisions of the driftare of importance in discussing the water conditions. They should not,however, be given the ra
Water Supply and Irrigation Papers of the United States Geological Survey . f Tertiaryage, consisting mainly of clay, micaceous sand, and a ferruginous,pebbly conglomerate. , These deposits are probably separated from theCretaceous by an interval of some consequence, and are known to beseparated from the next later formation developed in Illinois, the Pleis-tocene, by a wide interval. In the table on page 249 the several driftsheets of the Pleistocene are presented because these divisions of the driftare of importance in discussing the water conditions. They should not,however, be given the rank of the divisions in the Paleozoic table begins with the newest formation and extends to the oldest, a Water resources of Illinois, Seventeenth Ann. Rept. U. S. Geol. Survey, pt. 2, 1896, pp. Illinois Glacial lobe, Mon. U. S. Geol. Survey, vol. 38,1899, 817 pp. bNickles, J. M., Report of Illinois Board of Worlds Fair Commissioners, p. 217, Springfield, W. Rokker, State printer. 248 U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER NO. 114 PL. XV. GEOLOGIC SKETCH MAP OF ILLINOIS. LEVERETT.] ILLINOIS. 249 this being the order in which they are met by the drill. The extent ofthe several formations which lie beneath the Coal Measures has notbeen tested by a sufficient number of borings to penmit even approxi-mate calculations. The figures given are largely conjectural. Geologic column of Illinois. Formation. Wisconsin drift sheet (Pleistocene) Iowan drift sheet and main loess deposit (Pleistocene) Illinoian drift sheet (Pleistocene) Kansan drift sheet (Pleistocene) Pre-Kansan drift sheet?(Pleistocene) Tertiary deposits (perhaps of two or more epochs) Cretaceous deposits Permian beds ? Upper Coal Measures (Carboniferous) Lower Coal Measures (Carboniferous) Conglomerate sandstone (Carboniferous) Chester group (Carboniferous) St. Louis group (Carboniferous) Keokuk group (Carboniferous) Augusta or Burlington limestone (Carboniferous) Kinderhook group (Carbonif
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