164 
CEMENT MATERIALS AND INDUSTRY. 
I Bl'LL. L'43. 
composition, freedom from chert, and grinding qualities. Equivalent 
beds are now in use in Missouri and Kansas. These limestones are, 
furthermore, excellently situated as regards fuel and clay. The Pro- 
ductive Coal Measures, Des Moines formation, outcrop in a broad 
belt between the two, and often the Pella beds and shales of the Des 
Moines occur in the same section. Where the shales are absent, loess, 
such as is elsewhere used, is nearly everywhere present. 
FUEL. 
The area of the Productive Coal Measures, Des Moines formation 
is shown on the accompanying map. It will be seen that the cos 
mines are so situated as to afford cheap fuel to most of the limeston< 
localities. This is important, since the fuel cost forms approximately J 
30 per cent of the total cost of manufacture. Iowa coal, while not o< 
the highest grade, is still well adapted to cement manufacture. Thii 
following analyses indicate the approximate composition of a few ol 
the beds. These analyses and tests were made at the Iowa Stat f 
College of Agriculture, and are published in the report on Moure] 
County. a 
Analyses of Iowa coals. 
Volatile combustible 
Fixed combustible 
Total combustible 
Ash 
Sulphur 
B.T.U 
1 
2 
3 
4 
5 
6 
42.32 
37.79 
37.98 
45. 62 
46.06 
36.94 
46.31 
54. 85 
47.98 
50. 29 
46. 89 
54.20 
89. 13 
92. 64 
85. 96 
95. 91 
92. 95 
91.14 
10.13 
7. 36 
14.04 
4.09 
7.05 
s. 86 
4.10 
3. 29 
5.90 
2.74 
2.81 
2.86 
11, 922 
12,681 
12,431 
12, 041 
13, 050 
12, 245 
35.11 
51.91 
87. 02 
12. 77 
3.02 
1. Average five Monroe County coals. 
2. Centerville Block Coal Company, Appanoose County. 
3. Corey Coal Company, Webster County. 
4. Des Moines C. & M. Company, Polk County. 
5. Whitebreast Fuel Company, Pekay, Mahaska County. 
6. Carbon Coal Company, Wiilard, Wapello County. 
7. Average 22 Illinois coals. 
8. Pocahontas coal, Virginia. 
In the above tables the Pocahontas coal is quoted for comparis 
and the Illinois coals are noted, since, in event of the Trenton lii 
stone being used, coal would probably be drawn from Illinois rat 
than Iowa. Many additional analyses will be found in the spe 
report on the coal deposits forming Volume II of the reports of 
Iowa Geological Survey, and some additional data in the Twei 
second Annual Report of the United States Geological Survey. 5 
"Iowa Geo!. Survey, vol. 13, p. 414. 
1) The Western Interior coal field; Twenty-second Ann. Rept. U. S. Geol. Survey, pt. 3, pp.333- 
