:kel. j 
IOWA. 
159 
Samples of limestone from Pella, Tracey, Oskaloosa, and Humboldt 
ave also been analyzed, with the following results: 
Analysis of Iowa limestones. 
lea (SiO,). 
ipluble 
lumina (A1 2 3 ) 
on oxide (Fe 2 3 ) 
me (CaO) 
me carbonate (CaC0 3 ) 
agnesia ( MgO ) 
ilphur trioxide (S0 3 ).. 
irbon dioxide (C0 2 ) . . . 
r ater (H 2 0) 
4.92 
3.39 
47.50 
.00 
2.09 
38.10 
1. 57 
.49 
.17 
94.60 
3.17 
4.01 
.13 
.46 
95.30 
.00 
0.91 
.48 
.73 
97. 98 
L. Limestone, Pella. Lundteigen. analyst. 
?,. Limestone, Tracy. Murray, analyst. 
i. Limestone, Oskaloosa. Murray, analyst. 
I. Limestone, Humboldt. Murray, analyst. 
Analyses of limestone and inter bedded shale from the mouth of 
izard Creek in Webster County were made by Mr. Lundteigen, with 
le following results: 
Analysis of limestones and shale. 
CaC0 3 . 
CaSO, 
Upper, limestone, 2 feet.. 
Middle, shale, 2 feet 
Bottom, limestone, 2j feet 
88. (b 
53. 25 
88.75 
0.28 
2.46 
.17 
A cement made from this material gave the following analysis, and 
n test showed satisfactory color, strength, and setting properties. 
Analysis of Fort Dodge cement. 
lica (Si0 2 ) 25. 52 
lumina and iron oxide ( A1 2 8 and Fe 2 3 ) 8. 80 
ime (CaO) 63. 48 
agnesia (MgO) 1. 19 
The material from the Pella exposures has been made up into a 
jment which has good color, is sound on glass, sets very quickly, 
nd has satisfactory strength. The results of these tests, together with 
le fact that limestone of the same age and character is being exten- 
ively used at St. Louis, Mo., makes it certain that this formation 
in be relied upon to furnish the calcareous clement wherever other 
Dnditions are favorable to the establishment of cement plants. 
