84 DEPOSITS OF PHOSPHATE OF LIME. [bull. 46. 
[VI and VII. Analyses of two samples from northwest of Dinas Mowddwy and Llan-y.Mowddwy, 
North Wales, hy Hills (Quart. Jour. Geol. Soc. London, 1875).] 
VI. VII. 
Phosphate of lime 2.90 1.72 
Sulphur £4.38 34.20 
The rest was made up of sand, iron, and alumina. 
[VIII. Analysis of North "Wales phosphatic limestone, by Volcker (Rep. Brit. Assoc. A dvanc. Sci., 
1865, p. 38).] 
Tribasic phosphate of lime 34.92 
Oxide of iron 2. 34 
Alumiua 6.52 
Carbonate of lime 20. 75 
Carbonate of magnesia 5.92 
Magnesia, in a state of silicate 2. 07 
Iron pyrites 2. 79 
Sulphuric acid 0. 16 
Insoluble siliceous matter 20. 95 
Organic matter and loss 3. 58 
100. 00 
[IX. Analysis of phosphatic black shale, by Volcker (ibid., p. 38).] 
Organic matter and loss 3. 98 
Lime 37.16 
Phosphoric acid 29. 67 
Equal to tribasic phosphate of lime, 64. 16. 
Magnesia 0. 14 
Oxide of iron 1.07 
Alumina 5.84 
Matter insoluble in dilute hydrochloric acid 22. 14 
100. 00 
[X. Analysis of phosphatic black shale, by Volcker (ibid., p. 39) ] 
Tribasic phosphate of lime 52. 15 
Lime, present as fluoride of calcium and as silicate 4. 23 
Magnesia 0. 32 
Alumina 7. 71 
Oxide of iron 2. 01 
Sulphuric acid 0. 26 
Iron pyrites 7. 52 
Insoluble siliceous matter 22. 44 
Organic matter and loss '. .. . 3. 36 
100.00 
AMORPHOUS NODULAR PHOSPHATE DEPOSITS OF ENGLAND. 
Phosphates are found in England, both in the Cretaceous and Ter- 
tiary formations. The Cretaceous phosphates are the most important, 
in both quantity and quality. They occur in two different parts of the 
Lower Cretaceous, namely, in the Upper and in the Lower Greensand. 
Phosphatic beds of Cretaceous Upper Greensand. —The outcrop of the 
Upper Greensand formation in England begins in the north at Flam- 
borough Head, in Yorkshire, and runs west and southwest for about 
twenty miles, when it turns abruptly to the southeast and extends con- 
tinuously in that direction to within three miles of the north coast of the 
Wash, where it becomes covered with alluvium. It appears again on. 
(558) 
