94 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Surface soil and drift 



London Clay 



< 



21 



>190 



Well-section, Hanwell. {As the exact limits of the different beds 

 are not given in a printed section, the measurements here assigned 

 to them must be considered only as appi'oximate.) PI. I. Diag. A, 

 Loc, sect. 15. 



Feet. 



/Vegetable soil "I 



[Gravel, sand, sand and gravel J 



' Brick clay "^ 



Blue or London clay 



Piece of fossil wood 



Vein of stone {layer of septaria) ... 



Vein of stone (septaria) 



Fossil shell 



Several shells 



Vein of stone with shells imbedded 

 (septaria with Cyprina planata, As- 

 tart e, and fruit-like impressions'). 



Vein of stone {septaria) 



Indurated mud and sand J 



' Mud, sand, and pieces of wood {also 

 tabular septaria with bivalve shells 



not determinable) 2 



_Pebbles {flint) and shells 2 



f Mottled clay {red, grey, yellow, light 



green and puce) 23 



Sand 2 



Clay {mottled light grey and red) 13 



Indurated sand, clay, and mud {light 

 brown sandy clays with a seam of 



bituminous clay) 10 



Clay {mottled brown and light green) . 8 

 Green sand and clay {with some carbo- 

 naceous matter) 8 



Bed of oyster-shells as hard as rock... 3 



Pebbles {flint) 4 



Bed of flint-stones {in green sand) ... 4 



Basement-bgd of the London 

 Clay, ifeet. 



Woolwich and Reading Series, 

 Ihfeet. 



290 

 Chalk 30 



In this section the mottled clays descend very near to the chalk, 

 and are underlaid only by 3 feet of green sand, then by a concreted 

 mass of the Ostrea Bellovacina reposing upon a bed of round black 

 (flint) pebbles, under which comes the green-coated unrolled flints 

 overlying the chalk. The next section is at Castlebear Hill near 

 Eahng. 



Well-section, Castlebear Hill. PI. I. Diag. A, Loc. sect. 16. 

 (Communicated by Mr. R. W. Mylne*.) Feet. 



London Clay. Blue clay 300 



Ce. Sand and silt 30 



. Woolwich and 



Reading Series, < 



mfeet. 



d. Coloured clays and black clays with pebbles 15 



c. Black, yellow, and green sands 5 



b. Pebbles and black clay 9 



a. Flints 1 



To the Chalk 



360 



* For this and several succeeding well-sections I am indebted to Mr. R. W. 

 Mylne, the author of " Sections of the London Strata," towards the further illus- 



