8o OUR COMMON BRITISH FOSSILS. 



limestone is carried on). Nor should the picturesque 

 town of Ledbury be neglected with quietest of old 



English suburbs, the whole 

 town set in a framework 

 of woods and wooded hills. 

 The latter are frequently 

 pierced by quarries, from 

 which numbers of fossil 

 corals, characteristic of the 

 Upper Silurian formation, 

 may be obtained. To feel 



Fig. 63. Portion of Heliolites inter- llOW deliciOUS is the quiet 

 stinctus magnified, to show corallites. 



seclusion of a town like 



this, the pedestrian should enter it about two o'clock 

 some summer's afternoon ! 



The lateral foldings of the Upper Silurian strata of 

 North Wales have frequently obliterated the organic 

 remains, or left them represented by only feeble im- 

 pressions. Of course, except a few single and solitary 

 corals, we should not expect to find nor do we find 

 fossil corals abundant in any other than limestone 

 deposits, all other strata being formed in more or less 

 muddy water, as the nature of the sediments shows ; 

 whilst coral animals are noted for their love of clear 

 water, and their dislike to turbid. Hence in such beds 

 as the Bala limestone we frequently find abundance 

 of fossil corals. One of the best localities I know of 

 in North Wales is Mynydd Fronfrys, a few miles from 

 Llangollen. In an old quarry along the Oswestry road 



