SOMK ESSEX WELL-SECTIONS. 



59 



Shaft 35 feet ; the rest bored and lined with tubes to the depth 

 of 296^ feet, rising 2I feet above the bottom of the shaft. 



Water, found at 333 feet, rose to within 15 feet of the surface. 

 Four days later it had risen 3} feet. A few days later it stood at 10 

 feet below the surface. Yield about 240 gallons an hour. 



Thickness. Depth. 



Brickearih 30 



Blue clay, with clay-stones at 99^-100, 110^-111, 131- 



I3ii and 321^-322^ 303 



( Sand and pebbles, with water i 



[Rasement bed ?] < Dead sand ( , 



I Shells and pebbles ( ^ 



30 



333 

 334 



337 



Tilbury. — For Messrs. Fletcher and Fcarnall. 1887. 



Made and communicated by Messrs. Legrand and Sutcliff. 



Thickness. Depth. 



[Alluvium and | Soil 10 ... 10 



River Drift.] | Cla}-, peat, sand and gravel 66 ... 76 



Chalk and flints '. 54 ••• UO 



West Ham. — Gasivorks. 1891. 

 A boring, made and communicated by Messrs. Docwra. 

 AVater level loj feet down, July, 1891. Yield so small as to lead 

 to abandonment. 



ft. i 



Made ground 3 



Maiden ground I 



( Ballast [gravel] and clay 2 



( Clean ballast 10 



j Blue clay and shells =i 



< Shells o 



I Sand and pebbles i 



,'^Light[-coloured] clay 3 



Lightf-coloured] sharp clay and sand 9 



Loamy clay 3 



Blue clay and shells 8 



Very hard loamy sand 4 



Hard rock i 



Dark sand and clay 5 



Light-green sand 3 



Pebbles 2 



Green sand 8 



Dark sand and pebbles 8 



[^Pebbles 2 



Verj' hard dark-green sand 3 



Light-green sand 39 



Flints o 



^Chalk 2 



J Chalk and straggling flints. Water 

 J at 214 feet. A bed of flints, 2j 

 ( feet thick, at 239 feet 127 



Where the A\'oolwich Beds end off seems uncertain. 



[Made Ground 

 and Soil.] 



[River Drift, 

 13 feet.] 



[r London 

 Clay.] 



[? Woolwich 

 Beds.] 



[Thanet Sand, 

 42 i feet ] 



[LTpper Chalk]. 



255 



