116 DEPOSITS OF PHOSPHATE OF LIME 
[Analysis of Russian phosphate rock, hy Yermoloff.] 
Phosphoric acid 
Lime 
Magnesia 
[Russian rock phosphates, hy Yermoloff.] 
[BULL. 
20. 20 
29.07 
0.00 
5 3 
< 
Block phosphate from near Kursk, hy Glaus 
"Nodules from near Spask, by Yermoloff 
Nodules from near Spask, hy Yermoloff 
Block of nodules from one of the richest heds of the gov 
eminent of Tambov, by Yermoloff 
Fossil bone from same locality as last, analyzed at Agri 
cultural Institute of St. Petersburg 
Fossil wood from phosphate bed near Spask, byEngelhardt 
Phosphate from government of Orel, analyzed at the 
Agricultural Institute of St. Petersburg 
50.00 
9.50 
59.70 
35.50 
1.45 
7.10 
13.60 
27.48 
12.63 
20.26 
31.76 
35.23 
29. 84 
3.45 
3.95 
1. 
.86 21.00 
1. OS 
0.44 
0.85 
3.44 
6.06 
1.39 
42.00 
18.54 
29.07 
48.53 
51.90 
47.99 
0.65 
0.40 
1.48 
0.47 
2.20 
3.19 
3.47 
0.32 
1.15 
0.89 
[Analysis of Silurian phosphate rock from the Dniester, by Professor Schwackhofer.] 
Phosphate of lime . f 74. 23 
Sand and insoluble matter 5.61 
Fluoride of lime 6. 00 
Oxide of iron 0.50-5.0 
PHOSPHATIO LIMESTONE BEDS. 
Under this heading are included those sedimentary limestones which 
contain considerable quantities of phosphate of lime. Such deposits 
have been found in Kentucky ; and Yermoloff mentions that a lime- 
stone containing 12 per cent, phosphate of lime exists in the govern- 
ment of Novgorod, Eussia. 
Most limestones contain a small per cent, of phosphate, but as yet 
very few have been found which contain large amounts, and none are 
known which have become of commercial importance. 
PHOSPHATIC LIMESTONES OF KENTUCKY. 
Several beds of phosphatic limestone have been discovered by Prof. 
N. S. Shaler in Kentucky, but the one richest in phosphate of lime was 
found in Fayette County. 1 It belongs to the lower part of the Cincin- 
nati group and consists of a thin stratum, never reaching a greater 
thickness than from 6 to 12 inches. It is a " somewhat friable rock of 
a bluish gray color; brownish gray on the weathered surfaces; contain- 
ing many microscopic marine univalve shells. Adheres strongly to the 
tongue." It is much more brittle than the associated limestones, and 
contains 31.815 per cent, of phosphoric acid. It is probable that beds of 
1 Geol. Survey Kentucky, N. S. Shaler, Director, 187* 
(590) 
New Series, vol. 4, p. 65. 
