PRESTWICH WOOLWJCH AND READING SERIES. 



143 



Well-section, St. Mary' s Woolnoth, Lombard Street. 

 (Dr. Mitchell's MSS. vol. v. p. 21.) 



London Clay. 



II. Woolwich and 

 Reading Series. 



53 feet. 



III. Thanet Sands, 



Z&feet. 



Feet. 

 1 164 



{ 



Gravel 



Blue clav 



Sand! ' 2 



Sands and mottled clay 35 



Black flints and sand 16 



b. Sand, greenish 35 



a. Flints 1 



To the Chalk 253 



The following well, of which, like that at Messrs, Barclays, speci- 

 mens and particulars were carefully taken, is particularly interesting 

 from its confirming the same facts, and yet showing marked varia- 

 tions in the relative character of the heds a to o. ii. 



Well-section, Bank of England, 1851. 

 (From section published for private distribution, and from inspection of the spe- 

 cimens), PI. I. Diag. A, Loc. sect. 20. 



Feet. 



Made ground 22 



Gravel 4 



London clay Ill 



f 0. Light yellow mottled clay 2 



TO. Light yellow mottled clay, sandy 6 



m. Red and brown mottled clay 2 



/. Light-coloured sand 5 



k. Light-coloured mottled sandy clay li 



j. Liglit blue and brown mottled clay 8 



i. Carbonaceous clay and lignite li 



h. Liglit grey sand 2 



g. Lightgrey clay and shells (Cyrewa,ilfe/flraia) 1 



f. Dark grey clay and shells ( Cyrena, Melania, Ostrea) . 2^ 



e. Hard light-coloured concretionary limestone 3 



c?. Red, blue, and brown mottled clay 1^ 



c. Flint-pebbles in clay 5 



b. Bright dark green sand and flint-pebbles 13^ 



(^ a. Dark green sand with shells (Ostrea) 4 



b. Light grey sands, the lower part darker and more ar- 1 og 



Woolwich 

 and Read- 

 ing Series, 

 bSfeet. 



. Thanet 



Sands, 



39 feet. 



'.{ 



gillaceous. 

 a. Bed of flints 



1 



234^ 



Chalk 100 



334i 



In the next section the Woolwich clay beds are probably repre- 

 sented by Stratum/, ii. 



Well-section, Shoreditch Workhouse. (PI. I. Diag. C, Loc. sect. 6.) 



(Mr. R. W. Mylne.) 



Feet. 



Made earth 10 



Gravel 8 



London clay 58 



Carried forward 76 



