Essex Well-Sections. 
165 
at 122^, 6^- feet; at 200, 4§ feet; at 274 it ebbed and flowed 
with the tide, to 6 in. above and 6 in. below the marsh-level; 
at 860, 11|- in. above the marsh-level; at 502, 14 in. ; at the 
last, 19 in. (at high-water spring tides). Lowered to a depth 
of 80 feet by hard pumping. Yield, at depth of 360 feet, 
520 galls, an hour at 100 feet deep; at 502 feet, 1300 galls, 
an hour for the veins at 460 feet and 2200 for those at 502. 
26,000 galls, a day taken. 
[Alluvium ?, 
501 ft.] 
[? London Clay, 
40£ ft.] 
8 [? Oldhaven 
Beds, 51 ft.] 
3 [Woolwich and 
Reading Beds, 
sand, 
frag- 
/ Light-brown clay . 
Peat . 
Soft ooze . 
Grey sand . 
Grey clay, stones, and shells, 
with thin veins of black 
greasy sand . 
[Valley Gravel?] Sand and stones (about 81 in. 
diameter) forming a dark gravel . 
'Stiff dark brown clay. 
Sand and clay in veins . 
] Sandy clay and shells . 
Sandy clay . 
V Sandy clay and pebbles. 
Light-coloured running 
with water . 
Sand and oyster-shells . 
/Dark sand, with shell 
ments . 
Yellow ockreous sandy clay ... 
Greenish sandy clay . 
Fine green light-coloured sands, 
firm and dry . 
Dark sand and pebbles, with 
V fragments of shells. 
(-Fine greenish sand: top 9 ft. 
1 full of water, more solid and 
close at 170 ft. deep, very 
hard and dry at 180 ft., the 
bottom 40 ft. with water ... 
Greenish clayey sand; plastic 
at 246 ft. deep, at 253 ft. dry 
and firm, at 256 ft. looser, 
at 259 to 262 ft. bands of hard 
dry sandy clay, bottom 6 ft. 
more or less rotten sand and 
clay ... 
'"Green-coated flints. 
33i ft.] 
3 [Thanet Beds, 
ft.] 
1113- 
Thickness. Depth. 
FT. 
IN. 
FT. 
IN. 
16 
0 ... 
16 
0 
2 
6 ... 
18 
6 
4 
2 ... 
22 
8 
25 
10 ... 
48 
6 
2 
3 ... 
50 
9 
27 
6 ... 
78 
3 
28 
9 ... 
107 
0 
5 
10 ... 
112 
10 
1 
2 ... 
114 
0 
1 
6 ... 
115 
6 
o 
O 
0 ... 
118 
6 
4 
0 ... 
122 
6 
1 
3 ... 
123 
9 
9 
3 ... 
133 
0 
3 
0 ... 
136 
0 
9 
0 ... 
145 
0 
10 
0 ... 
155 
0 
2 
0 ... 
157 
0 
76 0 ... 233 0 
35 0 ... 268 0 
0 6 ... 268 6 
8 It is difficult to make out these subdivisions of the Lower London 
Tertiaries. 
N 
