W. WHITAKER ON SOME BORINGS IN KENT. 29 



Information communicated by the Docls:yarcl authorities differs 

 somewhat in details (to the base of the Chalk), giving the following 

 section. In the drawing from which part of this was taken the 

 thickness of the beds was different on opposite sides, and the mea- 

 surements were therefore made along a middle line. 



Marsh-clav and mud 



River-gravel (?9 to 12| ft.) 



Loam [Thanet Beds] 



/^ Chalk (soft rubble), with a layer of 



flints at bottom 



Block chalk, with many layers of flints 

 Hard rocky material, called " white 



flint" 



Chalk, with many layers of flints . . . 



Hard chalk. Fissures 45 ft. deep at 



about 300 ft., and a layer of black 



flint 234 10 621 



Chalk [a small specimen looked like 



ordinary Lower Chalk] 79 600 



Chalk Marl. At the bottom the fol- 

 lowing succession : —A soft bed, 2ft. 

 thick, underlain by sandy loam, 

 H ft., and then hard Chalk Marl, 

 1ft 110 710 



Chalk, 689 ft. 



Thickness, 

 ft. in. 



6 

 11 3 



3 9 



Depth, 

 ft. in. 

 6 

 17 3 

 21 



43 1 

 80 3 



64 1 

 144 4 



2 9 



139 1 



147 1 



286 2 



In June 1880 I saw, at the Dockyard, some of the cores that 

 were brought up. The lowest three feet or so of the Chalk Marl 

 was grey, with green grains, and with some small nodules (espe- 

 cially just above the base, which was given as 712 feet deep), differ- 

 ing slightly therefore from both versions of the section. The spe- 

 cimen showing the junction with the Gault was hardened ; one part 

 being Gault, the other Chalk. 



2. Chatham Dockyard Extension. — Well Ko. 2 (about 20 feet from 

 No. 1). 1880-1884. 



From documents communicated by the Admiralty and from 

 specimens. 



Measurements taken from the level of the coping of the new 

 basin, which is about 18 feet above Ordnance Datum. 



Shaft 450 feet ?, the rest bored. 



Water found 17th August, 1880, at a depth of 902 feet. After 

 five hours it flowed over the pipe, 3 feet above the level of the 

 coping. 



At 912 feet the water contained about 1 per cent, of sand, of 

 which several cart-loads were pumped up. The pump, 160 feet 

 down, lifted 300,000 gallons in 24 hours, keeping down the water 

 to 103 feet below the level of the coping. 



