308 
ANALYSES OF BOOKS, U. S. GEOLOGICAL SURVEY 
[no. 228. 
F. Near Fort Worth. 
G. East side of St. Johns River, near Seville. 
H. Corroded surface, Miami Reef. 
I. Near Oak Hill. 
J. Near Melborne. 
Analyses by F. W. Clarke, record No. 885. 
F. 
G. 
H. 
I. 
J. 
Si< )., 
2.94 
.23 
51.51 
.71 
41. 59 
2.64 
8.50 
.73 
47. 29 
1.51 
39. 00 
3. 37 
2.99 
.65 
51. 22 
.06 
41.22 
2.23 
5.87 
.95 
50. 34 
.37 
39. 62 
3.21 
17.83 
AUXFeX), 
1.18 
CaO 
43.85 
Mg() 
.26 
co 2 
34. 31 
H 9 
2.53 
99. 62 
100.40 
98. 37 
100. 36 
99. 96 
K. Coarse shell mass, Senote. 
L. Coral rock, Salt Key Bank. 
M. Loggerhead Key. 
Analyses by L. G. Eakins, record No. 882. The following analyses, 
also by Eakins, No. 883, are included for comparison: 
N. Coralline bottom, Barbados. 
O. Recent coral (Siderostria), Bermuda. 
K. 
L. 
M. 
N. 
0. 
SiO, 
.22 
! ,8 
54. 87 
.64 
4:5. 89 
.11 
.11 
) .04 
53. 54 
.71 
43. 87 
1.13 
.20 
1 .22 
53. 54 
.78 
43. 71 
.81 
1.17 
) •" 
46.45 
5.15 
43.40 
2.73 
.23 
A1 2 3 
) trace 
Fe 9 0o 
CaO 
55. 16 
MgO 
.20 
CO., 
43.74 
H 9 
.54 
99.91 
99.40 
99.26 
99.21 
99.87 
