166 Essex Well-Sections.
Tilbury Fort.—(Old Well).
'Gentleman's Magazine,' vol. lxviii., p. 565 (1798).
Dug 48 feet; the rest bored.
Dry earth [made ground ?] , thin.
Clayey beds, with leaves and branches of trees,
about 48 ft.
Quicksand.
Stiff marl, ? 30 ft.
Chalk-stones found at a depth of about 80 ft.
Tilbury Fort.—(Newer Well). 1849.
Communicated by Col. B. M. Grain, E.E. With further
information from Lieut.-Col. Brine, R.E.
Shaft and cylinders, 31 feet; the rest bored.
Water, March 22nd, 1849, good; April 19th, impure;
May 25th, good; since become quite unfit for domestic
purposes (although pipes were carried to a depth of 490 feet).