142 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



London 

 Clay. 



II. Woolwich 

 and Read- 

 ing Series, 

 62 feet. 



Brown and 



Thanet 

 Sands, 

 36 feet. 



vm 



22 



Feet. 



Brought forward 272 



"At 84 feet a thin layer of pebbles " 



At 92 feet a layer of septaria 



,, , -.^ At 96 feet a layer of septaria 



^' At 99 feet a layer of septaria 



I At 99 feet a mass of wood pierced by Teredo^ 



j. Mottled clays. Red and light greenish at 100 feet ' 



Light brown and grey at 112 feet 



Very light-coloured mixed sand at 113 ft. 



Brown and light grey at 114 feet , 



Brown and light grey at 128 feet "1 „ 



Light greenish at 129 feet J 



Brown at 130 feet 1 ^ 



Greenish and sandy at 134 feet J 



i. Light brown sand and grey clay 1 



h. Grey clay and vegetable matter 2 



g. Grey clay with a few shells (Cyrena ?) 3 



f. Mottled clays. Greenish, brown and grey at 141 feet... "I 



Red, full of race, at 146 feet I q 



Red and green at 147 feet I 



Brown and greenish at 148 feet J 



e. Sandy clays, partially mottled : 



Brown and greenish, with flint pebbles,"^ 



at 149 feet 



Do., with middle-sized pebbles, at 150 ft. >- 7 

 Do. .with larger-sized pebbles, at 152 ft. 

 Very small pebbles, subangular, 154 ft. J 



d. Clayey green sand with pebbles and wood 2 ? 



e. Green sand with larger pebbles 1 



b. Green sand, bright-coloured, a few pebbles, and Ostrea. "1 « 



„ „ large and worn Ostrea and a few pebbles J 



a. Grey clayey sand, with a few Ostrea Bellovacina at 167 ft. 



„ „ darker and more argillaceous, and 



Ostrea more numerous at 169 feet 



b. Grey sands, dark and greenish 



„ „ lighter 



_ a. Green-coated flints in argillaceous green sand 1 



35 



203 

 Chalk. 100 



Well-section, Fishmongers' Hall, north end of London Bridge. 



(Sections of Borings published bv the Metropolitan Commissioners 

 of Sewers, 1849 ; Sheet 3.) 



Feet. 

 Made ground, black boggy soil and peat ... 27 



Clay and sand 7 



Gravel 14 



London Clay. Blue clay 129 



jjr 7 • 7 id. Mottled or coloured clay 20 



II. lioolwich 07 71 1 11 



J „ ,. ] c. Shell -rocK , 11 



and Readinq , i /-. j c 



Series 6^ ft 1 *• Green sand 5 



' •' ' a. Fine sand mixed with pebbles 24 



Chalk. Til 



If the chalk is correctly placed in this section, which seems 

 doubtful, it must be a boss rising through the Thanet Sands. 



