Essex Well-Sections.
151
Feering, Gosfield, Great Canfield, Great Hallingbury,
Halstead, Hatfield Broad Oak, Hatfield Heath, Hood
End, Kelvedon, Little Hallingbury, Parndon, Quendon,
Rickling Green, Saffron Walden, Saling, Sawbridge-
worth, Terling, Thaxted, Tindon End, Wenden, Wicken
Bonnett, and Witham.
4. 'The Geology of the Neighbourhood of Colchester' (1880).
Appendix 1, pp. 18—18. By W. H. Dalton (and W.
Whitaker). Fifteen wells at Ardleigh, Clacton-on-Sea,
Colchester, Little Wigborough, Rowhedge (which should
have been entered under East Donyland), Stanway,
Tendring, Tollesbury, Weeley, and West Bergholt.
5. 'The Geology of the Country around Ipswich, Hadleigh
and Felixstow.' 1885. Appendix A, pp. 106—110, p.
152. By W. Whitaker and W. H. Dalton. Thirteen wells
at Dedham, Mistley, Ramsey, Bramble Island, Clacton-
on-Sea, Colchester, East Mersea, Frinton, and Walton.
In all, therefore, 130 Essex well-sections have been described
in these Memoirs, and to these 52 more are now added.
The chief geological value of these records is, of course,
in the details of the nature and thickness of the beds
passed through ; but, in addition to this, in many cases we
gain information about the underground water-level, and, to
some extent also as to the water-yield, both matters of practical
importance.
I hope that if any member should get a record of a well-
section that is not noticed, either in this paper or in one of
the above-mentioned Memoirs, he will himself communicate
such record to the Club, or will pass it on to me.
In the following sections the figures for thickness and depth
stand for feet, unless otherwise stated. [Remarks enclosed
within square brackets have been added by me to the original
accounts of the sections].
Aveley Marsh.—Marshfoot Farm. Within 100 yards of
the house. 1835.
Dr. J. Mitchell s MSS., vol.ii, p. 115, and vol. iii., p. 86.
Water rose to the surface. Yield 15 gallons a minute.
Thickness. Depth.
A little vegetable mould and moor bog ...... 20 ... 20
Gravel and sand, with a little yellow clay ... 50 ... 70