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PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [March 22. 





angle of about 30°, and 

 at the bottom is a small, 

 somewhat undulated 

 tract, composed of the 

 coarse detritus, as shown 

 in Sect. 3. As will be 

 seen on the plan, this 

 has been accumulated 

 in the form of a delta 

 at the top, at b, and also 

 at a, where the ravine 

 joins the valley, though 

 a great part has been 

 removed by the action 

 of the brook that runs 

 down it ; whence it 

 would appear that this 

 coarse detritus was 

 brought into the valley 

 down that ravine, and 

 from the part north of 

 the upper eastern end. 

 This is in the form of 

 an amphitheatre, the 

 inclination in the centre 

 being about 14°, pass- 

 ing quickly on each side 

 to 30°. Above it is 

 another small valley, at 

 a level of about 70 feet 

 higher, whose sides are 

 inclined at 30°, and 

 with a flat tract at the 

 bottom, as shown on 

 the plan and by Sect. 4, 

 which, however, I think, 

 is not due to deposit at 

 the bottom, but denu- 

 dation down to a uni- 

 form plane of bedding 

 of the rock. At the 

 upper end of this is a 

 very curious absolute 

 depression, as shown at 

 d, dowai to which the 

 sides of the valley pass, 

 whilst north of it they 

 gradually open out into 

 a wider depression, pass- 

 ing into the general denuded top of the hills, as shown on the plan, fig. 1 . 

 Still farther north of this is the steep escarpment of the large and deep 





n 

 5°. 



