268 
CEMENT MATERIALS AND INDUSTRY. [bull. 2< 
Analyses of crystalline limestones, North Carolina. 
Silica (Si0 2 ) 
Alumina (A1 2 3 ) .. 
Iron oxide (Fe 2 3 ) 
Lime (CaO) 
Magnesia (MgO) .. 
1.20 
.82 
52. 90 
1.91 
2. 
1.1 
49. 
3.61 
1. Culberson quarry, 11 miles southwest of Murphy, Cherokee County. 
2. Kinsey quarry, 5 miles southwest of Murphy, Cherokee County. 
Baskerville, analyst. Bull. North Carolina Geol. Survey No. 1, p. 233. 
So far as composition goes, these are certainly satisfactory enough 
for use in cement manufacture, but commercial considerations would 
prevent the erection of a Portland cement plant in this part of ttu 
State. 
SOFT LIMESTONES.. 
In the eastern part of North Carolina heavy beds of soft limestone 
occur in the Eocene and Miocene formations of the coastal plain. These 
soft limestones are the "maris" of early geological reports, but 
should not be confused with the fresh-water marls now so largely used as 
cement materials. The North Carolina limestones are usually low in 
magnesia, but often contain considerable percentages of clayey matter r 
or of sand. A deposit free from sand would be an excellent material I 
for use in making Portland cement, and clays to complete the mixture 
can readily be obtained in the same formations. 
Analyses of soft limestones ("marls"), North Carolina. 
1 
No. 
Silica 
(SiO a ). 
Alumina 
(AlsOs); 
iron oxide 
(Fe 2 8 ). 
Lime 
(CaO). 
4.88 
1.60 
50. 80 
7.27 
5. 23 
48. 55 
3. 54 
.97 
51. 74 
4. 56 
1.62 
50. 04 
(i. 97 
.86 
47.62 
26. 35 
5.47 
33. 03 
20. 39 
3. 83 
39.96 
7.27 
1. 63 
48. 55 
1.22 
1.30 
52. 90 
3. 54 
.97 
51. 74 
4. 95 
2.30 
50.59 
Magnesia ^Jf^ 
(MgO). j(^<>> Na, 
0.67 
1.39 
. 50 
1.72 
1.03 
.59 
1.42 
1.39 
1.07 
.50 
.58 
1.79 
1.06 
1.64 
.14 
.52 
.93 
.79 
1.06 
.30 
1.64 
.85 
Sulphur 
trioxide 
(80s). 
Carbon di- 
oxide 
(CO,), 
0.33 
40.60 
.20 
39. 35 
.49 
40. 61 
.45 
40. 55 
.41 
38. 15 
.28 
24.89 
.24 
32.46 
.20 
39.35 
.08 
42.33 
.49 
40. 61 
.18 
40.29 
Water and 
organic 
matter. 
0.27 
.45 
.16 
.58 
4.25 
6. 89 
.52 
.45 
.46 
.16 
.26 
1. Near Kinston, Neuse River. 
2. Twenty-rive miles north of Wilmington. 
3. Wilmington. 
4. Near Newberne. 
5. Lumber River, Robeson County. 
(i. Cape Fear River, 25 miles north of Wilmington. 
7. Kenansville, Duplin County. 
8, 9. Two miles above Rocky Point, New Hanover County. 
10. < me mile northeast of Wilmington, New Hanover County. 
LI. < me mile west of Rocky Point, New Hanover County. 
1 to 6. Bogardus and Hanna, analysts; vol. 6, Tenth Census Reports, p. 554. 
7 to 11. Quoted by Kerr, Rept. Geol. Survey North Carolina, vol. 1, pp. 191. 
