174 
W. WHITAKER-HERTS WELL-SECTIONS. 
Barnet.— Waterworks, 1876. Sunk and communicated by Messrs. 
T. Docwra and Son. Shaft 171 feet, the rest bored. Water 
rises to about 155 feet from the surface, and is lowered by 
pumping to 186 feet. 
[Surface deposits.] 
[London Clay 
113f feet.] 
[Reading Beds, 
50 feet] 
( Ashes and made ground. 
( Yellow clay and gravel. 
f Yellow clay . 
Yellow and blue clays . 
Yellow clay, with 6-inch bed of clay- 
stone [septaria] at top. 
Yellow and blue clays, with 6-inch bed 
of claystone at top . 
Blue clay, with 5 beds of claystone, from 
2 to 10 inches thick . 
-{ Blue clay and dark sand, with a 3-inch 
bed of claystone at bottom . 
Blue clay . 
Dark sand . 
Blue clay. 
[ Blue clay and sand, with 
small vein of shells 
Dark sand with water 
Pebbles . 
f Mottled clay . 
| White sand . 
Yellow and green sand . 
J Pebbles . 
] Red sand. 
Pebbles . . 
I Spring sand .? 
f Green flints . 
Ft. Ins. 
1 3? 
2 0 
2 0 
5 0 
16 0 
4 0 
45 6 
6 9 
6 0 
6 0 
9 0 
5 0 
8 0 
0 6 
13 0 
4 0 
3 6 
2 0 
4 0 
2 0 
20 0 
1 6 
To Chalk 167 
[Chalk, 293J feet. 
f Mild chalk, with an 18-inch layer of 
hard grey flint. 
Chalk, with 7 layers of flints, from 5 to 
12 inches thick . 
Very soft chalk, with very hard flints at 
bottom. . 
Chalk, with 4 layers of flints, from 4 to 
9 inches thick.. 
Chalk and flints. 
Chalk, with a 10-inch layer of grey flint 
- . in the middle. 
J Chalk and flints.. 
Chalk, chiefly sticky, with a flint layer 
Soft chalk, with a 30-inch layer of very 
hard flints near the top, and a thin 
layer below . 
Chalk, with a 9-inch flint layer at top and 
bottom. ' .... . 
Chalk, chiefly soft, with a flint layer . 
Very hard chalk and flints . 
Chalk, with 2 layers of flints in lower 
part . 
11 
30 
5 
35 
10 
10 
10 
13 
8 
7 
10 
2 
11 
0 * 
6 
5 
7 
8 
0 
4 
6 
0 
3 
6 
6 
0 
1 
[Carried over 333 4 
* Given in the drawing as 168. There may therefore be some error in the details. 
