176 PROC. COTTESWOLD CLUB vol. xiii. (3) 



such as the Severn (Fig. 2, B), which, working along the 

 strike of soft rocks, lowered the soft Lias country and so 

 left the Oolite in relief; that from these strike streams 

 anti-dip streams (Fig. 3, C) were developed, like the Chelt 

 and the Isborne, which work, and are working, back to 

 rob the original, but beheaded dip streams like the Coin 

 (Fig. 3. D)- 



Thus it may be understood that there are developed — 

 first, dip streams, on account of the surface slope; second, 

 strike streams, on account of the relative hardness of the 

 rocks ; and third, anti-dip streams, on account of the 

 difference of ground level. 



It may also be noted that of so many dip streams flow- 

 ing in a given direction (Fig. 4), one will become the 

 master stream by capturing, by means of the strike 

 streams which develop as tributaries (Fig. 5, B), the waters 

 of the neighbours (Fig. 5). 



— ^ 



-H 



F'g- 4 Fig. 5 



It is by such capture as this that the Cotteswold streams 

 flow to join the Evenlode at Oxford. They have been 

 captured by a strike stream — the Upper Thames. 



Examples of the various stages of river and valley de- 

 velopment were studied. 



The appended Figs. 6, 7, and 8 show the development 

 of a stream from slight curves into pronounced meanders. 



