594 ME. P. G. H. BOSWELL ON THE [Dec. 1913, 



mapping can be at best an approximation. It seems more than 

 probable that if other hills on the flanks of the valley were ex- 

 cavated, as those farther south have been, just as remarkable a 

 series of phenomena would be exhibited. 



The length of the portion of the valley that has been dealt with 

 in detail above is some 14 miles. 



It is not possible, nor is it necessary, to discuss the other Suffolk 

 valleys in such detail. The number of sections exposed on spurs 

 in the other smaller valleys is naturally less, but enough will be 

 summarized for the purpose of showing that the same conditions 

 obtained. 



Aide Valley: — (a) There is a spur on the right bank a mile 

 and a half south of Framlingham, through which runs a railway- 

 cutting showing contorted beds. 1 The officers of the Geological 

 Survey here noted 



' sand, with a little gravel. At a point about 130 yards west of the 89th mile- 

 post, is earthy gravel with a seam of clay showing strong contortions and even 

 inversion.' 



(b) Upon the spur on the left bank, a mile south of Framling- 

 ham, contortion and abutting of the Boulder Clay against other 

 beds was noted. 2 A detailed description is given in the Geological 

 Survey Memoir, and the irregularity of the beds, as observed in 

 mapping, remarked upon. 



(c) The spur on the left bank at Parham Wood shows some 

 disturbance, again first noted by the officers of the Geological 

 Survey. 3 A steep-sided channel eroded in Crag sand was observed 

 in the railway-cutting. 



(d) In the spur south of Snape Church, several pits, including 

 a brickyard, show much confusion of the beds. These were 

 observed by both S. V. Wood, Jun., and the Geological Surveyors.* 



(e) Spurs at Blaxhall, on the right bank of the river, contain 

 two pits, which I have figured, disturbances being described and, 

 in one case, figured by the officers of the Geological Survey. 



(/) The rise upon which Aldeburgh itself stands evidently 

 proved an obstacle to the ice : for, in the brickyard, intense con- 

 tortion of Chillesford Clay and Crag, etc., was to be seen some 

 years ago. The course which the River Aide now takes for 

 10 miles southwards before entering the sea is post-Glacial 

 deflection due to southerly tidal drift. 



Other smaller disturbances also occur in this valley. 



Deben Valley. — Comparatively few sections are exposed in 

 this smaller valley, but there is evidence of disturbance. 



(a) At the spur at Naunton Hall, Rendlesham, on the left bank. 5 

 Here, in the Stackyard Pit, a mass of Boulder Clay with almost, if 



1 Mem. Geol. Surv. 1886 (11) p. 33. 



2 Ibid. pp. 33, 34. * Ibid. p. 34. 

 4 Ibid. p. 29. s Ibid. p. 40. 



