Vol. 69.] 



THE AGE OF THE SUFFOLK VALLEYS. 



603 



to the south-east at 100 feet O.D., but the following table shows 

 the actual levels found : — 



Table op Borings in the Gapping Valley — Upper Portion. 



Locality. 



Height 

 above O.D. 



Thickness ' Chalk-surface 

 of Drift \ referred to 

 infect. I O.D. in feet. 



Elniswell 217 



Old Newton | 210 



Haughley j 160 



Stow market — Malting j 92 



Do. Brewery 100 



Do. Brickyard 135 



Do. Waterworks 100 



Do. Hewitt's Mill 95 



Creating St. Peter ' 164 



Combs ! 100 



Needham Market 100 



Chalk-pit near Creeting Hall 100 



127 

 128 

 100 



57^ 



71 

 113 



77* 

 100 

 145 

 ?57 



+ 90 

 + 82 

 + 60 

 + 34± 

 + 29 

 + 22 

 + 22| 

 - 5 

 + 19 

 ?+ 43 1 

 + 100 

 + 100 



Other wells show a corresponding thickness in Drift, but that at 

 Creeting St. Peter is a little surprising, as it lies rather outside the 

 present valley, while Chalk is exposed at a higher level at a pit 

 in the valley (Creeting Hall). The surface of the Chalk is very 

 irregular here, but a little lower down the valley the formation 

 crops out again at the levels to be expected, 100 to 120 feet O.D. 

 (Baylham, Bramford, Claydon, Needham, etc.). 



A number of fresh borings have recently been put down at 

 Ipswich, and these give more definite information as to the extent 

 of the buried channel there. Fig. 4 (p. 602) is a map of Ipswich 

 upon which these borings have been inserted. In the area round 

 the Dock some forty trial-borings, etc., had already been recorded; 

 in 1912-13 over thirty more have been made in connexion with 

 the proposed Dock-extension. Space permits only of the chief of 

 these being inserted. At present, only an average example of the 

 new borings need be quoted : — 



Feet. 



Alluvium. River-mud 2 



Terrace. River-gravel 7 



Chalk 10+ 



Many of the borings are begun beneath low-water, which is, for 

 spring-tides, —4 to —6 feet O.D., high-water being +9 feet O.D. 2 

 The level of the Chalk thus indicated varies from —25 to —32 



1 Two accounts of this well do not agree; see Whitaker, 1906 (21) p. 39. 



2 For this information, and that relating to the new Dock-borings, I have 

 to express my thanks to Mr. Thomas Miller, C.E., Engineer to the Ipswich 

 Dock Commissioners, and his son, who have very kindly given me every 

 assistance. 



