156 
CEMENT MATERIALS AND INDUSTRY. 
Analysis of Kinderliook limestone from Le Grande, Iowa. 
I bull. 243. 
Silica (Si0 2 ) and insoluble 
Alumina ( A1 2 3 ) 
J ron oxide ( Fe 2 3 ) 
Iron (FeO) 
Manganese oxide (calculated as MnO) . 
Lime (CaO) 
Magnesia ( MgO ) 
Carbon dioxide (C0 2 ) 
Hygroscopic water (loss at 100° C. ) 
Combined water (expelled by ignition) 
Phosphoric acid 
0.77 
.05 
0.96 
.07 
09 
55. 05 
.28 
43. 62 
.03 
.13 
.27 
.08 
54. 85 
.28 
43. 30 
.09 
.21 
100.02 100.11 
1.24 
.18 
.15 
.09 
50. 56 
3.70 
43.79 
.06 
.15 
Trace. 
99. 92 
1.22 
.14 
.26 
.09 
Trace. 
50.42 | 
3.96 
43. 85 
.04 
.12 
100. 10 
PROBABLE COMBINATIONS. 
Silica and silicates 
Iron, alumina, oxides, etc 
Calcium carbonate (CaC0 3 ) 
Magnesium carbonate (MgC0 3 ) 
Water (H 2 G) 
I 0.95 
J 
98. 30 
.59 
.16 
100. 00 
1. 37 
97. 95 
.38 
.30 
100.00 
1.74 
90. 28 
7. 77 
.21 
100.00 
1.72 
90. 04i 
8.08- 
.16 
100. 00 
1. Fine-grained oolite. 
2. Blue limestone. 
3. Iowa Caenstone. 
4. Stratified limestone. 
Associated with these beds are certain others which are more mag- 
nesian, but which happen to be in demand as building' stone. Possiblj 
a combination of industries could be based on this association. Ir 
Hardin County there is a considerable thickness of the rocks wit! 
some associated shale. Still farther to the north and west the Kinder 
hook outcrops, but without exposing any great thickness. While 
much of the Kinderhook limestone is magnesian, it is believed that ir 
localities where other conditions are favorable, the formation warrant 1 
prospecting and testing. 
OSAGE FORMATION. 
DISTRIBUTION. 
The Osage includes beds which have been widely known as tin 
Keokuk and Burlington limestones. The formation consists for th< 
most part of coarse crinoidal limestone, white, nonmagnesian, an< 
with chert in nodules along bedding planes. The limestone, in th 
