114 
CEMENT MATERIALS AND INDUSTRY. 
Analyses of Carboniferous shales from Arkansas — Continued. 
[BULL. 243 El 
l 
2 
3 
4 
5 
6 
7 
8 
Potash (K,0) 
Water 
1.36 
5.16 
1.90 
5.32 
2. IS 
6.87 
1.23 
6.12 
2.07 
7. 58 
2. 69 
7.90 
2.18 
9.11 
0.0 
5.1 
Total 
100. 48 
98.72 
100. 52 
Sand inair-drie< I clay 
21.88 
1. Clay shale from railroad cut at south end of upper bridge, Little Rock. 
2. Decayed shale from Iron Mountain railroad cut at crossing of Mount Ida road, Little Rock. 
3. Clay shale from Nigger Hill, Fort Smith. 
4. From Harding & Boucher's quarry, Fort Smith. 
5. Clay shale from Round Mountain, White County, sec. 6, T. 5 N., R. 10 W. 
6. From Clarksvillc, east of college. 
7. From SE. i of SW. | sec. 31, T. 10 N., R. 23 W. 
8. From NW. \ sec. 23, T. 1 N., R. 13 W. 
Analyses of Tertiary clays from Arkansas. 
Silica 
Alumina 
Iron oxide 
Lime 
Mag- 
Soda 
Potash 
\y. ,,,.,• Titani 
Water - acid. 
(Si0 2 ). 
(A1 2 3 ). 
(Fe 2 3 ). 
(CaO). 
(MgO). 
(Na,,U). 
(K 2 0). 
1 
63.07 
72.44 
69.95 
23.92 
18.97 
22.34 
1.94 
1.59 
1.44 
0.23 
.18 
Trace. 
Trace. 
Trace. 
.08 
1.08 
.91 
1.18 
1.15 
1. 35 
1.28 
7.07 
5.39 
5.98 I...J 
2 
3 
4 71.09 
19. 86 
1.81 
.11 
.81 
1 . 45 
5.67 
5 65. 27 
18. 75 
7.34 
.81 
1.26 
.81 
1.10 
6.88 ...J 
6 
64.38 
63.19 
17.29 
18.76 
8.25 
7.05 
1.11 
.78 
.80 
1.68 
.42 
1.50 
1.41 
.21 
6.95 ..... 
7.57 
7 
8 . 
64.49 
23.86 
2.11 
.31 
Trace. 
1.82 
.11 
8.11 
9 
67.90 
22.07 
1.33 
.05 
.59 
.38 
1.15 
6.86 
L0 
48.34 
62.34 
34.58 
20.63 
1.65 
3.34 
.81 
.17 
Trace. 
.67 
1.26 
.33 
.44 
.73 
12.94 1.1 
9. 34 1. 4 
11 
12 
68.03 
17.19 
3.00 
.81 
1.00 
.54 
1.00 
6.31 ..... 
13 
63.29 
76.33 
18.19 
16.04 
6.45 
1.24 
.31 
2.44 
Trace. 
.56 
5.40 ...J 
14 
By differe 
By differe 
By differe 
nee, . 99 
15 -75.99 
16.12 
1.35 
nee, 1. 45 
Hi 73. 24 
19. 61 
37. 39 
1.04 
1. 71 
nee, . 78 
13.49 
17 45.28 
1.83 .29 
1 
1 
1. Benton, Hick's bed, sec. 12, T. 2 
S.j R. 15 W 
2. Benton, Rodenbaugh, sec. 12, T. 
2 S., R. 15 
w. 
3. Benton, Herrick & Davis's bank 
4. Benton, Henderson's pit, upper 
oed. 
5. Mabelvale, A. W. Norris's well. 
6. Olsen's switch, "fuller's clay." 
7. "Fuller's earth," Alexander, SV 
L \ SE. i st 
c. 8, T. 1 S., K. L3 , * 
V. 
8. Benton, Woolsey's clay. 
9. Ridgwood, SW. i NE. \ sec. 25, 1 
\ 1N..R. 1 
2 W 
10. Benton, Howe's pottery. 
11. Clay from sec. 1, T. 8 S., R. 15 W 
12. Clay from sec. 5, T. 8 S., R. 15 W 
13. Clay from S. \ sec. 13, T. 2 S., R. 
13 W. 
14. John Foley's, NE. \ SE. \ sec. L8 
T. 13 S., h 
. 24 W. 
15. Climax pottery, W. .'., SE. \ see. 
5, T. L5S., 
I. 28 W. • 
16. Atchison's, NE. * NE. \ sec. 24, ' 
\ i S., R. 1 
7 W. 
17. Kaolin, sec. 
36, T. 1 N 
., R. 12 W. 
Tarpley's 
