ECONOMICAL GEOLOGY. 
227 
Lime, 31.68 
Magnesia, 0.79 
Sesquioxide of Iron, 9.60 ; no sulphur or phosphorus. 
But oyster shells from the Tertiary bluffs below Fayetteville, and lime- 
stone from the Eocene beds about Wilmington, (previously described), 
have been also used as fluxes in the furnaces of the region, and on account 
of their greater purity and abundance, and their ready accessibility and 
cheap transportation, will doubtless become the chief resource for fluxing. 
The seam of blackband between the main coal beds in the Egypt shaft, 
is stated by Wilkes to be 16 inches, the lower one to consist of two thick- 
nesses of 3 feet each, separated by a thin seam of coal between. He adds, 
“ This ore is readily distinguished from a slate by its brownish black 
color.” The analysis of this ore by Dr. Jackson, published in Emmons’ 
report, gives 
Carbon, 31.30 
Peroxide of Iron (Protoxide ?) 47.50 
Silica, 9.00 
Volatile Matter, 8.81 
Sulphur, 3.39 
Emmons adds, “ The roasted ore gives sulphur 0.89 per cent.” An 
analysis by Sclueffer for Wilkes, gives only 17 per cent, of iron, and 42 
of carbonaceous matter; specific gravity 2.12. 
The following analyses of samples selected from a recent opening at the 
Gulf, represented in the section given on p. 141, have been just com- 
pleted for the survey by Mr. Hanna : 
Specific Gravity, 
16 
2.361 
17 
3.150 
18 
2.110 
19 
2.110 
Silica, 
. 9.154 
7.089 
34.380 
5.188 
Alumina, 
. 4.244 
0.127 
19.638 
4.060 
Protoxide of Iron, 
. 19.419 
33.802 
12.361 
9.614 
Sesquioxide of Iron, 
. 0.000 
1.755 
1.430 
0.938 
Sulphide of Iron, 
. 10.485 
2.145 
2.023 
7.146 
Oxide of Manganese, 
. 1.750 
1.980 
■0.995 
1.500 
Lime, 
. 9.520 
12.672 
3.100 
14.040 
Magnesia, 
. 1.490 
1.170 
1.220 
0.863 
Alkalies, 
. 0.000 
0.000 
<0.000 
0.000 
