Essex Well-Sections. 
153 
Dug 45 feet; the rest bored. 
Good supply of water. 
Blue [London] Clay, to sand and black pebbles, 100 feet. 
Two wells at Romford are given as the same. 
Onigwell. — Grange Hill. 
Dr. J. Mitchell’s MSS., vol. iii., opp. p. 72. 
Dug 228 feet; bored 170 feet. 
Water abundant; rose to about 160 feet from the surface. 
Through stiff clay, almost all blue, a foot or so at bottom 
mottled. 
Chingford Mill. For the East London Waterworks 
Company. 1885 
Communicated by Mr. W. B. Bryan, the Company’s 
Engineer ; and from Messrs. Docwra. 
38 feet above Ordnance Datum. 
Cylinder and shaft 50 feet; the rest bored (3 feet to 2 feet 
diameter). 
Water rose from the bore to 5 feet 1 inch above the surface. 
Water-level, in July, 1885, 2 to 3 inches below the surface. 
Thickness. Depth. 
54 ft.] 
41* ft.] 
10 
... 10 
/'Blue clay . 
441 
... 541 
Sandy clay. 
7§ 
... 62 
Black pebbles [basement- 
l bed]. 
2 
... 64 
/Sand . 
44 
... 681 
Mottled clay . 
3 
... 714 
White sand. 
11 
... 821 
Dark sand . 
74 
... 90 
| Pebbles . 
1 
... 91 
1 Dark sand. 
101 
... 1014 
'.Black pebbles . 
4 
... 1051 
j Dark sand. 
35 
... 1404 
(Flints . 
1 
... 141i 
56 ft.] 
Chalk and flints. 
deep (6in.), at 243 (6 in.), at 249 (10 in.), 
and at 296 (4 in.). At 306 very hard chalk 
(for 4 feet down), at 336 very soft chalk, 
at 385 very hard chalk and flints, at 404 
hard chalk and flints (for 42 feet down) ... 
3094 
451 
