GEOLOGY OF THE AVON BASIN. 19 



foi-mal,i()Ti!H " (foe. cit., p. 239). Nc.iv Portislioad, liowover, 

 tlio symmotry of the ridge is somewhat broken ere it ends 

 abruptly on the shore of the Severn. 



If the reader of this paper would make him.self i>ractically 

 acquainted with the district of which it treats, let him take 

 train to Portishoad. As ho leaves the station lie will see on 

 the other side of the road an exposure of some of the bods 

 of the Lower Limostono Shales, dipping at a high angle to 

 the N.W. Turning to the riglit, and proceeding towards the 

 laiuling-placo, ho will roach in a few minutes a considerable 

 quarry, in which beds of the same series, also dipping steeply 

 N.W., but curving over near the surface, arc being worked 

 for the embankment just outside the station. The position 

 of these beds is fixed by tlie occurrence of the 13ryozoa T5od 

 (see Cont. I!, p. 8), of which charaoiovistic specimens in;i,y 

 bore be ro.adily obtained. Tlio position of this bod in tin) 

 Avon section is, it will be remembered, about ninety feet 

 from tho base of the series of Lower Limestone Shales. 



To tho N.E. of tho quarry is tho station near tho landing 

 «fcage. Here beds of Old Red Sandstone are seen. At first 

 sight they seem to have a gentle dip to tho N.E. ; but more 

 careful investigation shows that tliis af)p(iaranco is dcocptivo, 

 and that tho bods in truth dip steeply to the N.W. 



Climbing down on to the rocks beneath tho hotel grounds, 

 tli(>y lire found to bo composed of a roddisli sandstone ovor- 

 liiln by Dolomitic Conglomerate. Tho grain of tho sand- 

 stone, however, is not like that of the Old Red, and tho 

 tolerably abundant occurrence of indistinct but unmistak- 

 able plant remains of a Carboniferous typo shows that the 

 sandstone belongs to the Coal Measure series. The beds dip 

 steeply in oiiposite directions, vk. N.E. and S.W., within a 

 space of 100 yards, bnt tho strike remains the same. 



Ascending to tlio road tbrougb l-ho hotel grounds, \v(- find 



