1 36 
CEMENT MATERIALS AND INDUSTRY. 
[bull. 243J 
The Chicago Portland Cement Company plant is located at Oglesbv 
Lasalle County. The following section is exposed in their quarry 
from above downward: 
:l 
Section at quarry of Chicago Portland Cement Co., Oglesby, III. 
Limestones feet . . 2 
Black slaty shale do 
Coal inches. . 
Harder gray shale feet. . 
The raw materials used at the plant are limestone from this quarij 
and shale from both of the beds noted. Analyses of the raw material 
are given in the following table, that of the shale being from the 6-foo 
bed of black shale: 
Analyses at cement materials from Oglesby, III. 
Silica (Si0 2 ) , 
Alumina ( A1 2 3 ) 
Iron oxide (Fe 2 (\) 
Lime (CaO) 
Magnesia (MgO) 
Sulphur trioxide (S0 3 ) 
Carbon dioxide (C0 2 ) . 
Water 
Limestone. 
6.06 
3.92 
49. If) 
.91 
.10 
39.06 
Shale. 
53. 1 
20 
1.0 
4.0 
2. 
n. d 
13.70 
S 
) 
The plant of the German-American Portland Cement Compan}^ i| 
located just east of Lasalle. The quarry shows 8 to 10 feet of lime- 
stone, underlain by 3 to 3i feet of blue shale, and this in turn is under- 
lain by 11 to 12 feet of limestone. Other shales outcrop beneath the 
lower limestone, but are not at present used in the cement plant 
Analyses of the raw materials, made by Mr. W. E. Priissing, follow. 
Analyses of cement materials from Lasalle, III. 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) 
Iron oxide (Fe 2 3 ) . . . 
Lime (CaO) 
Magnesia (MgO) 
Carbon dioxide (C0 2 ) 
Water 
Limestone. 
5.43 
1.43 
52. 02 
1.11 
40. 24 
5.06 
2.32 
48.29 
3.66 
41. 05 
Shale! 
1 2. 37 
11. 
The plant of the Marquette Cement Company is located at Dickin- 
son, about 5 miles south of Lasalle. The limestone used is derived i 
from the two heavy beds included in the Coal Measures of this district 
