224 
CEMENT MATERIALS AND INDUSTRY. 
[bull. 
The following section is exposed in the river bluffs at Louisiana 
Pike County: 
Section of river bluff at Louisiana, Pike County, Mo. 
Surface clay, yellow 
Mississippian: 
Burlington limestone 
Shale, sandy 1 
Hannibal shale, olive 
Louisiana limestone „ 
Devonian shale, dark, slaty 
Silurian: 
Limestone 
Hudson shale, blue 
An analysis of the Hannibal shale from this locality will be foun 
in the table on page 225. 
Analyses of Mississippian limestones, Missouri. 
Number. 
1. 
2. 
3. 
4. 
5. 
6. 
/ . 
8. 
9. 
10. 
11. 
12. 
13. 
Silica 
(Si0 2 ). 
1.10 
2. 00 
4. 35 
1.24 
4.05 
2.86 
3.20 
5.77 
4.71 
2.47 
.72 
.15 
.08 
Alumina 
(A1 2 3 ). 
Iron oxide 
(Fe 2 3 ). 
0.40 
.40 
1.75 
.37 
.37 
.35 
.40 
.43 
.22 
.31 
40 
Lime car- 
bonate 
(CaC0 3 ). 
94.00 
95. 15 
77.95 
97.71 
93.21 
89.26 
93.20 
89.95 
94. 15 
92.30 
98.06 
99.64 
98.80 
Magnesiu 
carbonate 
(MgC0 3 ) 
3. 

1. Valley Park railroad cut, St. Louis County. Missouri Geol. Survey, Bull. 3, p. 77. 
2. Vigus station quarry, St. Louis County, ibid. 
3. St. Louis, St. Louis County. Ibid. 
4. Goetz quarry, Bartold Valley, St. Louis County. Ibid. 
5-6. Workhouse quarry, St. Louis County. Ibid. 
7-8. Lorentz quarry, near Cahokia street, St. Louis, St. Louis County. Ibid., p. 76. 
9-10. Quarry, foot of Barton street, St. Louis, St. Louis County. Ibid. 
11. Carthage Marble Co. W. B. Potter, analyst. 
12. Star Lime Co.'s quarry, near Hannibal, Marion County. Twentieth Ann. Rept. II. S. Geol. Sur 
vey, pt. 6, p. 415. 
13. Hannibal Lime Co.'s quarry, near Hannibal, Marion County. Ibid. 
