i899 



S. BUCKMAN.— WYE VALLEY 



29 



Lias on the high ground above, that channel must have 

 been subsequently filled with Mesozoic strata, and must 

 then have been re-excavated by the present river Avon. 



Something further may be said concerning the 

 meanders of the Lower Wye, their manner of develop- 

 ment in a river valley, and their possible effacement by 

 an accelerated stream. I have made some addition to the 

 following remarks since the paper was read, and have to 

 acknowledge my indebtedness to the written and verbal 

 communications of Prof. W. M. Davis. 



The appended Figs, i, 2, 3 show the development of a 

 stream from slight curves into pronounced meanders, 

 which become greater as the river impinges more first on 

 the one bank and then on the other. In these figures 

 A A are the sides of the valley, B is the curving stream, 

 and C C are the " spurs " of the convex portions of the 



B A' 



A A' A' 



I'ig. I. Initiating Fig. 2, Pronounced curves Fig. 3. Considerable meanders 

 curves and well-developed spurs with tendency to obliterate spurs 



valley. These spurs tend to become more and more 

 worn away with the development of the meanders, on 

 account of lateral encroachment of the stream — encroach- 

 ment, that is, on the sides of the spurs ; and it is the 

 up-stream sides of the spurs which are most worn away. 



