• Gl 



ouces 





« and o 



fossil sin 

 ht. 



of Grypi. 



Its. 



cd of Z 



m 



marine fosa 



• on Flu™ 



)ther 

 oft, sandv. 



nd, cement' 

 serks.y 



e 



Very ^ 



Pres 





Soft » 



ye. 

 its. 



fii' 



,d of f 

 Its * 



AND SANDS. 



51 



/Silica - 

 Alumina 

 1 Potash 



Soda - 



- 84 



- 9 



- 



- 



Peroxide of iron, with a little manganese - 4 



Sulphate and carbonate of lime 



Phosphate of iron - - - - - 



Free alumina _ . _ - - 



Chloride of sodium (a trace) - - 



Moisture, with a little organic matter - 1 



00 

 40 

 54 

 10 

 00 

 05 

 01 

 40 



Upper 

 Galleby. 



Wall-case 41. 



30 



99-80 



118a.— Upper 



Malm 



This rock has been found to contain 40 * 30 per cent, of 

 soluble silica (that is, of silica soluble in solutions of caustic 

 potash or soda, on boiling in open vessels), and 41*23 of 

 insoluble silica, -with 14*50 of alumina, &c. It furnishes a 

 rich soil, for growing hops, &c. 



Farnli 



M 



H8b- — Upper green sand, very calcareous and hardened 



by the ^cementing lime. 

 Wight 

 119. 



f Brixton, Isle of 



Eocene) 



and containing an included pebble of flint. 



This sand forms the lowest member of the tertiary series, 

 and occurs between the Chalk and the Woolwich and Reading 

 Beds, in the district comprised between Sandwich, Canter- 

 bury, and the Reculvers. In the eastern portion of the 

 London basin it attains a maximum thickness of eighty to 

 ninety feet, but disappears west of London, where the Wool- 

 wich and Reading Beds are based directly on Chalk. 

 Presented by Joseph Prestwich, Esq., F.R. S. 



120. — Portland sand. Soft sand, underlying Portland 



limestone. 



Wilts. Map 



r 



