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10
It may be interesting to give the thickness of the various strata passed
through in the boring at Kentish Town by the Hampstead Water Company, as
obtained from the Report to the President of the Board of Health above mentioned.
Feet.
1. London clay 236
2. Sands 88½
3. Chalk and chalk-marl 586
4. Marl, and sand of the Upper Greensand series 72
5. Gault 130½
6. Red and yellow sands, red clay, white and red sandstone,
greenish sandstone, &c. &c 188½
The chalk seldom comes nearer the surface in this parish than about 200 feet;
and there is no water fit for drinking to be procured without passing through
the clay (which is from about 150 to 250 feet in depth) to the chalk or to the
sands immediately above this stratum.
I have the honour to remain, Gentlemen,
Your obedient Servant,
THOMAS HILLIER.
21, Upper Gower Street,
November 3rd, 1857.