170 SOME ESSEX WELL-SECTIONS.
This section gives further evidence of the extension of the deep
channel of Drift described in "Quart. Journ. Geol. Soc," vol. xlvi.,
pp. 333-340 (1890) and Essex Naturalist, vol. iii., pp. 140-42,
and vol. iv., p. 117. The most northerly well noted in those papers
is at Littlebury. The above is two miles farther north, and another
well at Whittlesford, over three miles still farther, showing 621/2 feet
of Drift over the Chalk, also in the valley of the Cam and in
Cambridgeshire, has been described in a Geological Survey
Memoir ("The Geology of South-Western Norfolk and of Northern
Cambridgeshire," 1893, p. 156).
(1, N.W.) Chingford.—The "Bull and Crown." Old well.
Communicated by Mr. T. Hay Wilson.
About 170 feet above Ordnance Datum. Said to be 275 feet
deep, and always with about 30 feet of water, which was soft, and
probably therefore not from the Chalk.
This well supplied the neighbouring part of Chingford, until the
East London Company's water was laid on.
(1, N.W.) Chingford.—Holly House, King's Head Hill.
After 1874.
Communicated by Mr. A. Sheldon, through Mr. T. Hay Wilson.
About go feet above Ordnance Datum.
Shaft 80 feet. Bored 80 or 85.
Water rose to within 40 feet of the surface.
London Clay, pale bluish or slate-coloured. The last IO feet through blue,
brown, and yellow mottled clay into sand and black [flint] pebbles [? Basemen
bed].