O GEOLOay OF THE AVON llASIN. 



are somowhah different. The lino of depression K. of the 

 Clifton-Clevedon ridge extends a little to the W. of Naish 

 House, bat beyond this has no existence. N. of this depres- 

 sion the country slopes tolerably uniformly down to the 

 low-lying alluvial ground. The Clapton brook i-ises to the 

 extreme W. of the depression, near Naish House, and then 

 flows in a wooded combe to more open country, where it 

 receives small tributaries on either side before reaching the 

 alluvium of the moor. 



But perhaps tlie most noticeable features in tJio western 

 part of the Clapton district are the rounded, often tree- 

 covered, bosses on the slope. One of these is seen just to . 

 the N. of the village ; another to the left-hand side of the 

 road leading to the church, and a third above Court Farm. 



Altogethoir, the physical features of the neighbourhood 

 of Clapton differ somewhat markedly from those of the 

 Portbmy and Faihinds districts which lies fa,rthor E. 



3- — The Qeoloijic.al Structure of the District. 

 It requires but little acquaintance wil^h the rocks of the 

 neighbourhood of Bristol to enable the observer to ascertain 

 that Conygar Hi]] is composed of Dolomitic Conglomerate. 

 The beds are shown in natural outcrop on the hill, and are 

 well exposed in the large quarry on its W. sid(\ Tlioy are 

 seen to dip gently towards the Severn. The size of the 

 fragments is variable, being largest in the lower part of the 

 S. end of the quarry, where they are perhaps not far from 

 their junction with the Old Eed Sandstone. From this, 

 point they diminish in size : (I) as we rise into overlying 

 beds ; (2) a,K wo pass northwiirds (which was in Triassic 

 times, seawards or lake wards). 'I'he large included frag- 

 ments are angular, or but little rounded, and many of them 

 derived from the Mountain Limestone, some from the Old 



