JCKEL.] 
ARKANSAS. 
ANALYSES. 
Ill 
Analyses of chalk and chalk marl from southwestern Arkansas. a 
No. 
Silica 
ism,) and 
insoluble.'' 
Ferric oxide 
and alumina 
(Fe 2 3 +Al 2 3 ). 
Lime (CaO). 
Magnesia 
(MgO). 
Equal to 
lime 
carbonate 
(CaCO a ). 
Equal to 
magnesium 
carbonate 
(MgC0 3 ). 
1 
6.15 
25.13 
8. 53 
7. 32 
27. lis 
12.67 
6.83 
7.86 
7.97 
14.68 
4.91 
7.35 
34. 76 
12. 65 
43. 09 
21.90 
75.77 
30. 68 
43. 72 
35.16 
31.05 
31. 01 
36.17 
32. 26 
30. 84 
30. 29 
5.79 
3.90 
1.22 
1.26 
5.00 
1.93 
.95 
1,30 
1.09 
2.15 
.93 
1.06 
5.18 
1.66 
6. 55 
2.35 
5.46 
4.91 
2.76 
2.85 
3.46 
2.93 
5.37 
7.05 
3.73 
3.31 
46.81 
35.81 
48. 50 
49. 94 
34.81 
45. 56 
50.41 
49. 55 
49.64 
45.03 
51.78 
49.66 
29.10 
45. 85 
22.77 
40. 57 
5.72 
32. 60 
27. 95 
32.75 
32. is 
34. 63 
29.16 
17.24 
34. 31 
34.77 
0.33 
.61 
.38 
.32 
.61 
.43 
.22 
.28 
.35 
.44 
.30 
.34 
.71 
.49 
.92 
.59 
.91 
.48 
.42 
.43 
.69 
.50 
.48 
.63 
.60 
.55 
83.60 
64.32 
86.60 
89. 17 
62. 15 
81.35 
90. 01 
88. 48 
88.64 
79.40 
92.46 
88.67 
51.95 
81.87 
40.65 
72.41 
10.21 
58.22 
49.90 
58. 48 
57.41 
61. 83 
52. 06 
30. 78 
61. 26 
62.08 
0.69 
2 
3 
1.28 
. 78 
4 
.67 
5 
1.28 
6 
.90 
7 
.46 
8 
.58 
9 
.73 

.92 
1 
.63 
2 
.71 
3 
1.49 
4 
1.02 
5 
1.93 
6 
1.23 
1.91 
8 
1.00 
9 
.88 

.90 
1 
1.44 
2 
1.05 
3. 
1.00 
4 
1.32 
5 
1.26 
6. 
1. 15 
|By chemists of the United States Geological Survey. 
b" insoluble" refers to insoluble in HC1. The other columns refer to the soluble portions only. 
References to analyses. 
locky Comfort area. 
1. SW. i of SW. i sec. 32, T. 12 S., R. 32 W., 2 miles southwest of Rocky Comfort. White chalk 
near the middle of the chalk formation. 
2. NE. i of NE. i sec. 30, T. 12 S., R. 32 W., 2 miles west of Rocky Comfort, The chalky marl 
immediately below the white chalk. 
3. Rocky Comfort, Little River County, Ark., near the NE. corner of NE. ^ see. 28, T. 12 S., R. 32 
W., from lower middle part of the white chalk formation. 
4. Same locality as 3, from the lower part of the white chalk formation. 
It 'Vhitrfl ijl's area. 
5. NE. i of NE. I sec, 35, T. 11 S., R. 29 W., top of the lower sandy marl bed beneath the white 
chalk. 
6. Chalk bluff, Whitecliffs Landing, near the middle of the bluff in the lower part of the white 
chalk. 
7. Chalk bluff, Whitecliffs Landing, 15 feet above the base of the purer white chalk. 
8. Chalk bluff, Whitecliffs Landing White chalk 10 feet below the top of the cliff. 
9. Cement works, Whitecliffs Landing. Average of the lower 35 feet of the purer white ehalk 
in the quarry at the cement works. 
