445 



PROCEEDINGS 



OF 



THE GEOLOGICAL SOCIETY. 



POSTPONED PAPERS. 



1. On a Pectjliae Iiststaijce of In^teaglacial Eeosion near 

 NoEwicH. By Seaeles Y. Wood, Junr., Esq., P.G.S., and !F, W. 

 Haemee, Esq., E.G.S. 



(EeadAprUH 1869*) 



The object of the present brief notice is to bring before the Society, 

 while the works are in progress, a feature of intraglacial structure 

 disclosed by the sewerage works at JISTorwicb, in order that, since 

 the case appears to us to be peculiar among the perplexing fea- 

 tures presented by the glacial beds as far as yet known, the oppor- 

 tunity may be afforded, to any who may suspect that some mistake 

 has been made, of investigating the accuracy of our representation 

 before the means of doing so are removed. Eor this reason we 

 have ventured to bring the subject forward now, instead of reserv- 

 ing it for description mth the general glacial structure of the east of 

 England, which we hope at some future time to lay before the Society. 



All the valleys of Suffolk, and of Central and Eastern Norfolk, 

 are excavated out of the glacial beds, and possess no connexion 

 whatever with any preglacial condition of the surface. They appear, 

 however, to have had their configuration and direction determined 

 in several places by a denudation of the glacial beds themselves, 

 which was effected during the progress of their deposit. Of this 

 the case before us affords one instance. 



The accompanying section shows the structure of the valley of 

 the Yare, near the places of its inosculation with that of the Tese 

 and that of the Wensum. 



The sewer-works, up to the present time, have been carried on by 

 shafts, sunk in the bottom of the valley, where the surface is con- 

 siderably below the line maintained by the chalk on either of its 

 sides. These shafts have disclosed that a hole or, it may be, a narrow 

 trough in this part descends abruptly, and almost perpendicularly, 

 into the chalk, and that in it Hes, not merely one of the successive 

 beds (5) which form the solid mass of the country around, but also 

 another bed which does not appear to exist elsewhere in the neigh- 



* For the Discussion on this paper, see p. 260 of the present volume. 



2h2 



