QEOLOay OF THH AV()^f BASIN. 



3 



Along' its iiortlioj-n border in low ground, but slightly raised 

 above the sea level. Down the northerly slope which sepa- 

 rates these two run several streams. To the E. is the 

 Easton brook, mentioned in my former paper; then follow 

 tlu) Portbury brook, Charlton brook, and Caswell brook ; 

 while to the W. is the Clapton brook.* But the slope down 

 which these streams flow is by no means uniform, nor are 

 the valleys io which tliey run of similar character through- 

 out their course. 



If the reader will take train to Portbury, and then ascend 

 Conygar Hill, which lies just ^. of the Priory, lie will find 

 that he stands in an ancient camp on a detached portion of 

 an irregular ridge running roughly speaking E. and W. On 

 either side of the hill the ridge is broken by the Portbury 

 brook to the I'l., and the Charlton brook to the W. The 

 fidgo moreover sends out strongs purs southwards. Imme- 

 diately to the E. of Conygar Hill is a spur, beyond which 

 the ridge is slightly notched by au old stream-course long 

 ago deserted. Farther E. is the still bolder spur of St. 

 George's Hill, beyond wliich is the Easton brook, bounded 

 still farther ]<]. by a still bolder spur. To the W. a wooded 

 spur bounds the left bank of the Charlton brook. 



South of the irregular ridge on. which lie stands, which we 

 may call the Portbury I'idgo, lies an open valley, in which 

 I'un the Poi-tbury a,nd Charlton brooks, the watershed or 

 divide between which, is very low, as is also, but not so low, 

 the divide between the Poi-tbury and Easton brooks. 



Io the S. of this 0])en valley is a second irregular ridge, 

 on which to the extreme E. stands the newly built Failands 

 '-church, near the source of the Easton brook, and in which, 



' (;iv(! th(!Kc names for convrnioiico ol rci'crcncc. 'i'l)<-'y nro not 

 "aiucd on Uiu Orauancii aui'vcy ma];!. 



