Vol. 69.] AGE OF THE SUFFOLK VALLEYS. 599 



Hifccham in the valley, as the Rev. E. Hill has pointed out in the 

 course of correspondence, there seems to be good evidence of deep 

 hollows in the Chalk. In the Brettenham well (280 feet O.D.) 

 312 feet of clays and sands were met with above the Chalk, the 

 upper surface of which here is thus —32 feet O.D. Mr. Whitaker 

 classes all these beds as Drift, but Mr. Hill suspends judgment. 

 From the mixed nature of the beds in the section, one would feel 

 inclined to suggest that Eocene and Pliocene deposits had been 

 ploughed up and incorporated with the Drift. 

 The following: is the section under discussion : — 



Thickness Depth 



in feet. in feet. 



f Blue Boulder Clay with Chalk stones 141 141 



I Rough red sand 16 157 



Loamy sand with grey clay 5 162 



I Fine red running sand 30 192 



■{ Grey clay mixed with red sand 6 198 



Rough red sand with shells 15 213 



Hard rocky substance ... 4 217 



Conglomerates 5 222 



^ Plastic clay with flints (? Boulder Clay) 90 312 



Chalk, with occasional beds of flint 232 544 



Glacial 

 Drift. 



Certainly plastic clay is found in the Lower Eocene beds, but 

 never more than a few feet thick. It should also be pointed out 

 that Brettenham Park is about 4 miles north of the present limit 

 of the Lower London Tertiaries ; they are present at Sudbury, 

 Hadleigh, and Ipswich, but are rapidly thinning off by erosion. 

 Detailed mapping of the beds has proved that, even after they 

 have disappeared north-westwards, material from them is included 

 in Glacial Drift north of their outcrop. Their previous farther 

 extension north-westwards is thus indicated; they and the Crag 

 which lies above them were considerably eroded in pre-Glacial 

 and Glacial times. 



A boring in Hitcham Street (at 175 feet O.D.) went through 104 

 feet of Drift without reaching Chalk, which normally crops out in 

 the vicinity at over 120 feet O.D. The Rev. E. Hill remarks that 

 this ' is interesting as revealing a buried valley.' At Cross Green, 

 just to the north-east, 250 feet of Drift were cut through before 

 Chalk was reached. As we descend the Brett Valley, the Chalk 

 is seen to crop out at the surface at 120 to 130 feet O.D. at Monk's 

 Eleigh (zone of Marsiqntes), Chelsworth, Bildeston, Wedging (zone of 

 Actinocamax quadratus) ; and at Cosford Bridge and Kersey, 2 miles 

 north of Hadleigh, at about 100 feet O.D : it is also found in 

 borings at Whatfield at over 130 feet O.D. At Hadleigh, however, 

 a second buried channel appears to be revealed. A boring made for 

 Messrs. Woods & Co., at 90 feet O.D., shows 90 feet of Drift lying 

 directly upon Chalk, no Crag or Eocene deposits being recorded. 

 A second boring at the Mai tings (80 feet O.D.) cuts through 

 a series of sands and clays 100 feet thick, which Mr. Whitaker 



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