Essex Well-Sections. 
151 
Feering, Gosfield, Great Canfield, Great Hallingbury, 
Halstead, Hatfield Broad Oak, Hatfield Heatli, Hood 
End, Kelvedon, Little Hallingbury, Parndon, Quendon, 
Bidding Green, Saffron Walden,. Saling, Sawbridge- 
wortb, Terling, Tbaxted, Tindon End, Wenden, Wicken 
Bonnett, and Witbam. 
4. ‘ Tlie 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, Bowhedge (which should 
have been entered under East Donyland), Stan way, 
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 
atDedliam, Mistley, Bamsey, Bramble Island, Clacton- 
on-Sea, Colchester, East Mersea, Frinton, and Walton. 
In all, therefore, 180 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. [Bemarks 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 
Chalk.1. 87 ... 107 
