152 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Well-section, South side of the Export Dock, West India Docks. 



(Dr. Mitchell's MSS. vol. iii. p. 85.) 



Feet. 



Made gravel (.') 15 



Clay 5 



Gravel 25 



„. .c J , r Clear sand 30 



Thanet Sands l^^^^^^^^^j^^^j^ ^^ 



120 

 Chalk 240 



1 give this section from its peculiarity. The occurrence of shells 

 above the Chalk I have not had confirmed. 



Well-section, Trinity Wharf, Blackmail. 

 (Mr. K. W. Mylne.) 



Feet. 



Made ground 18 



Gravel 45 



London clay* 68 



_, , . , , \ d. Grev sand 8 



^i. Woolwich and e. Shells and iron pyrites 2 



Reading Series, I ^ Oyster-shells and sand 14 



64:Jeet. [ a. Stiff green sand 10 



III. Thanet Sands, J b. Grey sand 65 



nifeet. \ a. Stiff sand and clay 7 



237 

 Chalk 10 



Well-section, West Ham, Essex. 

 (Mr. R. W. Mylne.) 



Feet. 



Made ground 8 



Black gravel 9 



Peaty clay 16 



[g. Pebbles 2 



j /. Shelly 4 



, Woolwich and e. Light brown sand 18 



Reading Series, \ d. Clay and shells 6 



bS/eet. \ c. Hard shells 5^ 



I b. Green sand ,. .. l-^ 



[a. Pebbles 5 



Thanet Sands. Sand 57 



132 

 Chalk 306 



* In the section of this well, and of the one at Bromley, I feel considerable 

 hesitation in retaining the designation of " Loudon clay " here given by the well- 

 digger ; for I am rather induced to think, from the outcropping of the Woolwich 

 couglomerate in the river at Blackwall and of the Basement-bed of the Loudon 

 clay at Stratford, that the London clay does not exist in the first-named localities. 

 It certainly may be there, and be thrown out by a fault on a line near adjacent. 

 I consider it however more probable that the mineral character of the stratum 

 has led to some mistake, and that the bed here taken to be the London clay may 

 be a peculiar condition and unusual development of the mottled clays, where they 

 clash and mix with the upper part of the Woolwich clays and sands, losing their 



