LATER TERTIARY GEOLOGY OF EAST ANGLIA. 



9D 



Middle Glacial a thin bed of 

 dark brown loam, which also 

 fills a pothole excavated some 

 5 feet or thereabouts in that 

 drift. 



After what we have observed 

 as to the action of percolating 

 water on the Red Crag, and 

 especially the enwrapping of a 

 prominence of Crag by bands of 

 dark brown loam produced from 

 the dissolution of the Crag ma- 



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(see section II.), we are far from 3 



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and filling the pothole was ^ 



formed as a surface soil, and g 



the pothole excavated during J 



the interval represented by the |* 

 denudation which we have been 

 discussing ; and both the loam 



and pothole may be due only to IT 



percolation ; but we think that ST g * | 





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as no sign appeared of the sand g |~ J i^ 

 itself following the loam into g- ' p^p 

 the pothole, there is some pro- 

 bability of this bed really repre- & 

 senting an interglacial land sur- 

 face. It is also worthy of no- 

 tice that the interglacially de- 

 nuded slope of the Contorted 

 Drift is almost coincident with 

 the postglacially re-excavated 

 valley-slope. 



Having regard to the two 

 lines of sections XVI. and 

 XVII. across the Waveney at 

 distant points, and to what we 

 have described as to the pre- 

 sence of the Middle Glacial 

 along the valley-sides generally 

 down to the edge of the sheet of Postglacial gravel which fills the 

 valley-bottom in some parts (as for some miles on either side of 

 Bungay), and to the edge of the alluvium sheet elsewhere, there 

 seems to us no reason to doubt that the valley of the Waveney is of 

 interglacial origin, like the other valleys of Norfolk which we have 

 been describing, and like the valleys of Suffolk which we have 

 presently to describe. The following hypothetical section (XIX.) 

 represents what we believe to be the true, though concealed, structure 

 of this valley. 



Q. J. G. S. No. 129. h 



