239 



1852.] PRESTWICH ON THE THANET SANDS. 



Fig. \.— Section of the Cliff a mile and a half east of Heme Bay. 



Feet. 



Upper ; 

 Division, 



Middle. ^ 



Lower part of the London Clay 40 



3. Light-coloured fossiliferous sands. 



{Basement-bed of the London 

 Clay) 



4. Light-coloured greenish sands 

 with brown clays . Traces of bg- 

 nite and a few fossils 



: 2i r.i;i. Base of Cliff. TJie superposition be- 

 :.--'X. low this point is proved by a well 

 :::■■!:: at the Reculvers. 



Lower. 



5. Light-coloured fossHiferous sih- 

 ceous sands, the lower part very ^ 



argillaceous '' 



{The Thanet Sands.) 



to 80 



Fig. 2.— General section of the strata beneath London. 



The London Clay. 



Sands, pebbles, and shells 



,4. Sands, mottled clays, and peb- 

 ble-beds very irregularly m- 

 terstratified 



Feet. 

 100 to 150 



1 to 3 



1 5 to 45 



5 Light-coloured siliceous sands . . 20 to 50 

 {The Thanet Sands.) 



The Chalk. 



r2 



