100 3. V. WOOD, JUN., AND F. W. HAKMER. ON THE 



Fig. 19. — Hypothetical Section (XIX.) showing the general Structure 

 of the Waveney Valley. (Vertical scale 17| times the horizontal.) 



1. Formations older than the Contorted Drift. 



6. The Contorted Drift. 



7. The Middle Glacial, including therein any valley-bed of interglacial 



age that may be concealed under the alluvium &c. 



8. Upper Glacial. 



9. Gravels posterior to No. 8. 



10. Postglacial valley-gravel and recent alluvium. 



It seems to us that the high ground of Central as well as much of 

 that of East Suffolk is underlain by the Contorted Drift ; but, with 

 the exception of a very few exposures, this is concealed everywhere 

 by the Upper Glacial, while the Middle Glacial intervenes in the 

 same irregular way in which it occurs over the Contorted Drift in 

 that part of Northern Norfolk to which the Upper Glacial does not 

 extend. 



It is our view that into the troughs or valleys which were inter- 

 glacially excavated in the Lower Glacial and Crag and other older 

 beds, the Upper and Middle Glacial were bedded so as to obliterate 

 those troughs more or less. Most of the troughs thus filled in 

 have been re-excavated postglacially, so as to form the present lines 

 of drainage ; but others have not ; and among them is the supposed 

 south-easterly continuation of the Waveney valley to which we 

 have already adverted. The map which accompanies our " In- 

 troduction " shows that the Lower Glacial beds crop out con- 

 tinuously * along both sides of the Yare valley below Norwich 

 down to its inosculation with that of the Waveney, where this 

 bends to the north-west and where section no. XVI. is taken, as 

 they do also along the northern side of the rest of the Waveney valley 

 for some distance in the direction of Beccles. 



On both sides of the river at and near Beccles the Chillesford 

 beds and Lower Glacial sands are present ; but between Beccles and 

 Lowestoft we could find no trace of either on the south side of the 

 Waveney t, and the Middle Glacial overlain by the Upper Glacial 

 seems to stretch along the valley-side from Beccles to near Lowes- 

 toft. Now it is through this part, south-eastward to the coast at 

 Kessingland, that we consider the inosculated interglacial trough of 



* This continuity is doubtless less than represented in the map referred 

 to, owing to the concealment, in places, of the Lower by the Middle Glacial on 

 the valley-sides ; but this could not well be represented on the small scale of 

 the map. 



t Except, possibly, the bed mentioned at page 96 as occurring at the bottom 

 of the cutting of the Lowestoft branch Railwav. 



