PRESTWICH — "WOOLWICH AND READING SERIES. 



151 



Well-section, City of London Union, Mile End Road. 



(Mr. R. W. Mylne.) 



Feet. 



Made earth and vegetable earth 4 



Yellow dry earth 2 



Coarse gravel mixed with fine sand 15 



Fine gravel and sand , 14 



Mixture of clay, sand, and water 20-2 



Hard dry blue clay 40 



Soft blue clay with fine silky running sand 12^ 



S andy cl ay, yellow-coloured, and sm all stones 2| 



Hard yellow sand 1 



Sandy clay, yellow and green 4 



Compact sandy clay 2 



London Clay. 



II. Woolwich and 



Reading Series, \ f. Compact green clay. 



Alfeet. e. Compact yellow and green 2 



d. Hard yellow clay and large pebbles 7 



c. Green sand 1 



b. Black sand 2 



a. Black sand and small pebbles 6 



r e. Black sand, compact 4 



mi. to 1 <^. Black sand, less compact 5 



Thane t Sands, I r., i i n -^ , 



oQi f f \ c. Black clay, sandy grit 1 



'^J ' \h. Black sand mixed with black clay, and soft 21\ 



\_ a. Black flints, small 1 



Chalk. 



175 

 10 



I feel very uncertain where I should draw the lines of division in 

 this section. They must be considered as doubtful. I am almost 

 inclined to carry Group ii. down to c. iii. inclusive. 



Basement-bed ~\ 

 of the London [■ 

 Clay, bfeet. J 



r 



Well-section, Bromley near Stratford. (PI. I. Diag. A, Loc. sect. 23.) 



(" Geology of England and Wales," p. 45.) 



Feet. 



Loam, clay, gravel, and sand 18 



London clay 44 



Blue clay 2 



6. Clay, sand, and s^e/& mixed 1 



a. Gravel, sand, and sAe&' 4 



i. Fine sand 4 



h. Blue and yellow clay 9 



g. Sand and */<e//«, with large lumps of pyrites... 4 

 /. Blue clay, with abundance of broken shells, 



some resembling oysters, and pyrites 9 



e. Solid limestone 1 



d. Black sand, passing into small round pebbles, "j 



like the Blackheath pebbles 



c. Black sand, veined >22 



1 b. Some small pebbles in the sand, which is still 



I hard and compact J 



1^ a. Blue clay, very hard and firm 2 



II. Woolwich and 



Reading Series, 



hi feet. 



Beneath this last bed are probably the Thanet Sands. 



120 



