!KEL. ] 
INDIANA. 
137 
nd noted in the sections given on pages 131 and 135. Shales occurring 
elow the limestone are mined to complete the mixture. Analyses of 
be raw materials used are as follows: 
Analyses of cement materials from Dickinson, //I." 
ilica (Si0 2 ) ' 
Jumina ( A1 2 3 ) I 
ron oxide (Fe L ,0 3 ) I 
ame (CaO) 
[agnesia (MgO) 
ulphur (S) 
arlxm dioxide (CO.,) 
Limestone; 
8 
20 
1 
30 
49. 37 
85 
n. 
d. 
39 
72 
Shale. 
5-1.30 
L9.33 
5. 57 
:;. 29 
2. 57 
2.36 
n. d. 
The fourth Portland cement plant in the Stale is that of the Illinois 
>teel Company. This is located at Chicago, and uses a mixture of 
last-furnace slag and crushed limestone. 
BIBLIOGRAPHY OF CEMENT RESOURCES OF ILLINOIS. 
In addition to the few papers listed below data on limestones and 
lays are scattered through the various volumes of reports issued by 
he Illinois geological survey. 
}onover, A. D. [Limestones and sandstones of Illinois.] Reports Tenth Census, 
vol. 10, pp. 219-226. 1884. 
Iies, Heinrich. [Clays of Illinois.] Prof. Paper U. 8. Geol. Survey No. 11, pp. 
94-97. 1903. 
PORTLAND-CEMENT RESOURCES OF INDIANA. 
PORTLAND-CEMENT MATERIALS. 
Three of the geologic groups represented on the map of Indiana 
PI. XII, p. 270) contain limestones which seem worthy of considera- 
tion as sources of cement materials. These three groups are: (1) 
Cincinnati shales and limestones; (2) Mississippi limestones and shales; 
3) limestones of the Coal Measures. 
In addition to the three formations named, whose areas of outcrop 
ire shown on the map, a fourth source of cement is found in the 
[resh-water marls of Quaternary age. 
ORDOVICIA^ SHALES AND LIMESTONES. 
CINCINNA TT SHA LES . I ND L I M ES TONES. 
DISTRIBUTION. 
The Cincinnati group occurs only in southeastern Indiana, occupying 
part or all of the counties of Union, Wayne, Fayette, Franklin, Dear- 
born, Ohio, Switzerland, Ripley, and Jefferson. In this area it is 
aTwentieth Ann. Kept. U. S. Geol. Survey, pt. <;, p. 544. Analyses furnished by company. 
