PENROSE, j 
PHOSPHATES OF NORTH CAROLINA. 
73 
rock, and occasionally are not found at all. They are kidney and egg 
shaped and generally much less bored and irregular than the South 
Carolina nodules. They vary from gray to greenish black in color and 
have a specific gravity of 2.6 to 2.7. 
t 
Fig. 30. Strata overlying the phosphate bed at Castle Hayne, New Hanover County, North Carolina. 
A, sand; B, ferruginous, sandy clay; C, green clay; D, indurated peat; E, calcareous marl; F, 
white shell rock; G, phosphate conglomerate; H, marl containing smaller nodules. Scale : 1 inch = 
5 feet. 
Two companies have been formed to grind this conglomerate rock 
and sell it for local use. The wjiole mass does not contain more than 
10 to 20 per cent, phosphate of lime, but it is said to have been success- 
fully used as a fertilizer. The separate nodules are very variable id 
composition. 
Table of analyses of North Carolina rock phosphates made at the North Carolina experiment 
station. 
fl to XI. From neighborhood of Warsaw, Duplin County.] 
Moisture 
Samples dried at 212 degrees F. 
contain sand and insoluble 
matter 
Carbonate of lime 
Phosphate of lime 
Equivalent to phosphoric 
acid.... 
r 
n. 
III. 
IV. 
V. 
VI. 
VII. 
0.92 
1.57 
1.08 
1.79 
1.73 
1.06 
0.63 
38.09 
28.92 
42.96 
5.17 
59.47 
29.46 
37.36 
3.81 
2.43 
4.18 
5.91 
3.12 
54.89 
4.96 
45.16 
57.18 
42.46 
37.28 
28.19 
3.90 
44.51 
20.10 
26.19 
19.45 
17.07 
12.91 
25.15 
20.39 
Moisture 
Sand and insoluble matter 
Carbonate of lime 
Phosphate of lime 
Equivalent to phosphoric acid 
VIII. 
0.66 
30.44 
6.30 
53.03 
24.29 
IX. 
0.39 
36.59 
6.30 
45.78 
20.97 
45.62 
4.59 
39.86 
18.26 
(547) 
XI. 
44.73 
2.30 
39.33 
18.01 
