PRESTWICH — WOOLWICH AND READING SERIES. 



139 



Appendix. 



Well-sections to follow, for reference, after the section at Park Hill, Croydon : 

 ante, p. 99. 



South to North sections, — -from Croydon to Ware. 

 At Mitcham Mr. Nightingale kept the following careful record of 

 his well, and preserved a series of specimens, but I found the shells 

 generally too much crushed by the auger to be determinable. 



Well-section, Nightingale^ s Factory, Mitcham^^, 1850. 



Feet. 



Black mould 3^ 



Gravel Oi 



London Clay. Blue clay 101 



0. Blue clay mixed vnth 5Ae//s 2 



n. Rock {septarid) 3 



m. Blue sand with a small quantity of water 3 



I. Blue clay mixed with shells 3 



k. Black clay, very hard 1 



j. Blue clay 3 



i. Peat earth, very soft and open (lignite) 3 



11. Woolwich h. Bright hi ue clay 3 



and Read- J g. Black clay mixed with white shells {Cyrena) 1 . 

 imj Series, \ f. Slate-coloured marl mixed with yellow {Mot- 



A(>feet. tied clay) 3 



e. Yellow mixed with pink {do.) 4 



d. Red and pink (do.) 4 



c. Blue sand mixed with clay 5 



b. Green sand mixed with clay, gait, and light 

 blue sand 1 



a. Green hard sand mixed with black pebbles 



and white gait 7 



c. Blue-drab coloured sand 22 



5. Darker sandy loam 15 



a. Green-looking flints, black and brown inside : 



a good spring of water 1 



r 



Thanet 

 Sands, 

 38 /ee/. 



189 

 Chalk, with layers of flints every 3 feet, and an abundance of 

 soft water in every layer, finishing the well at 211 feet. 



Well-section, Copper Mills, Garret, near Wandsworth. 

 (Mr. E. I'Anson, Jun.) 



Feet. 



Gravel „.... 9 



Grey clay 70 



b. Indurated clay 1 



a. Rolled pebbles OJ- 



u. Grey clay 4 



t. Yellow grey clay 2 



s. Blue clay 2 



r. Carbonaceous matter and clay OJ 



q. Shells 1 



p. Grey clay 2 



Carried forward 92 



London Clay... 

 Basement-bed of 

 the London Clay, 

 l-hfeet. 



:. Woolwich and 

 Reading Series, 

 54 or 62 J feet. 



* For the section of a well at Streatham Common, see Trans. Geol. Soc. 2nd ser. 

 vol. ii. pt. 1. p. 135. 



VOL. X. — PART I. L 



