File:The mineral content of Illinois waters.. (1909) (14597086260).jpg

Identifier: mineralcontentof00bart (find matches)
Title: The mineral content of Illinois waters..
Year: 1909 (1900s)
Authors: Bartow, Edward, 1870-1958
Subjects:
Publisher: (n.p.)
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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nnesota, Iowa, and Missouri. It isa very pure sandstone, consisting of well rounded quartz grains, mod-erately coarse. For the most part it is destitute of any cement materialbetween the grains, and this renders its texture open and gives it agreat capacity for holding water, which is freely yielded when the rockis tapped. It overlies the Lower MagTiesian limestone from which it isoften separated by several feet of varicolored clays. In thickness itvaries from 100 to more than 200 feet, as may be seen in the followingrecords of wells made along the line across the State from Kock Islandto Chicago. Thickness of the St. Peters Sandstone in the Northern Part OF THE State. Feet. Rock Island 145 Moline 216 Milan 195 East Moline , 220 Geneseo 220 Princeton 116 LaSalle 175 Ottawa 130 Marseilles 200 Peddicords well, near Marseilles 275 Seneca 220 Joliet 200 Lockport 210 Blue Island 115 Chicago Heights 200 Union Stock Yards 155 Goose Island 60 13 STATE GEOLOGICAL SURVEY. BULL. NO. 10, PLATE 1.
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Geological map of Illinois. (After Leverett by courtesy of the U. S. Geological Survey.) 14 MINERAL CONTENT OF WATEES. (bull. no. 10 In the western part of tlie State, the St. Peters sandstone some timesincludes a shaly stratum near its middle portion, and in most placesthe formation is overlain by a dark clay which occasionally is slightlyoily. The principal intake area of this formation is in southern Wisconsin,in the southeast part of Minnesota, and in some limited localities inthis State. It comes to the surface in the south central part of La Sallecounty in the Illinois river valley and in the valley of Eock river in Oglecounty. Another small outcrop has been found on the Mississippi riverin Calhoun county. At all of these points it has been elevated by thefolding already spoken of as effecting the Lower Magnesian and the Pots-dam formations. Elsewhere it is covered by later sediments, but itsposition and the depths at which it may be found bv drilling are fairlywell known from e

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