penrose.1 PHOSPHATES OF CENTRAL FRANCE. Ill 
[III. Similar noilules, analyzed at the ficole des Mines, Paris.) 
Silica 4. 80 
Alumina and oxide of iron 3. 20 
Carbonate of lime 45.82 
Phosphate of lime 40. 13 
[IV. Sables Verts nodules, by Nivoit (Assoc, franc, avanc. sci., 1875).] 
Loss by calcination 
Sand and clay 
Phosphoric acid 
Sulphuric acid 
Oxide of iron 
Lime -. 
Magnesia 
Loss and matter not determined. 
Total 
I. From 
Islettes. 
15.00 
27.98 
18.72 
4.30 
21.00 
2.10 
0.90 
100. 00 
II. From 
Louppy le 
Chateau. 
9.60 
23.80 
22.03 
2.12 
11.30 
29.33 
Trace. 
1.82 
100. 00 
III. From 
d'Ander- 
nay. 
10.50 
31.03 
18.78 
0.89 
15. 65 
20.80 
Trace. 
2.35 
100.00 
IV. From 
Beurey. 
8.00 
39.80 
16.30 
0.92 
10.60 
22.00 
0.89 
1.49 
100. 00 
100. 00 
[V. Gaize nodules from Grand Pr6, by Nivoit.] 
Loss by calcination 7.20 
Sand and clay 13. 50 
Phosphoric acid 31.00 
Sulphuric acid 1. 00 
Oxide of iron -• 7.50 
Lime 38.50 
Loss and matter not determined 1. 30 
Total 100.00 
[VI. Nodules from the Marnes Crayeuses, Sainte-Marie, by Nivoit.l 
Loss by calcination 16.20 
Sand and clay 26. 30 
Phosphoric acid 1 8. 00 
Oxide of iron 12.15 
Lime 27.35 
Total 100.00 
PHOSPHATES OF CENTRAL FRANCE. 
The phosphates of the center of France, in the department of Cdte- 
d'Or, and in the southeast, near the source of the Rhone, around Belle- 
garde, are of the Lower Gault and Lower Greensaud formations. They 
differ in no material way from the corresponding beds in Ardennes and 
Meuse. The same formations are worked farther south along the 
Ehone, at Seyssel, near Grenoble, and elsewhere. In Isere and Drome 
there is a bed not represented in the north; it is a thin, glaucouitic 
stratum, lying between the Valenginien and the Marnes d'Hauterive. It 
contains Belemnites dilatatus and Belemnites pestilliformis. The same 
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