508 



rKOCEEDINGS OF THE GEOLOGICAL SOCIETY. 



Pig. 5. — Section at ShejJton Mallet. 



a. Lower Lias. 



b. E-haetic Conglomerate. 



c. Veins of Lias. 



d. Carboniferous Limestone. 



The beds in this section in ascending order are as follows :- 



Stone 



ft. in. 



. 10 



. 8 



. 1 



. 2 9 



. 2 



. 2 10 



. 1 



. 1 2 



. 10 



. 6 



. 1 3 



. 1 3 



. 1 3 



Stone 



ft. in. 



. 4 



. 1 



. 7 



. 7 



. 10 



. 10 



. 8 



. 8 



. G 



. 4 



. 4 



. 6 



6 



The stone at Sutton, in South Wales, is of two kinds : — the Bas- 

 tard Sutton stone at the base, which is a very coarse conglomerate, 

 and in which alone the corals of that place are found ; and finer- 

 grained whiter limestones above, which are without corals, and with 

 but few univalves as compared with the beds below. In litholo- 

 gical character the above section at Shepton is perfectly identical 

 with the finer-grained or true " Sutton Stone;" and so far as their 

 organic contents are concerned, it is impossible to recognize any 

 distinction. There is the same abundance of Pecten Pollux, Lima 

 gigantea and all the other characteristic shells of the same horizon, 

 and, in this instance, in association, as at the railway section, with 

 Ammonites BucMancU and a still higher Liassic form, A. obtusus ? 

 The same Piscina Pavidsoni, Moore, mentioned before, again occurs 

 attached to the shells from these beds ; and I have also found 

 Pollicijpes, identical with one which is abundant in the upper beds at 

 Langan. 



Crossing Cowl Street from this roadside-section, and taking a 

 pathway up the hill through a field to the waterworks, blocks of 

 stone may be seen containing abundance of Lima duplicata and 

 Ostrea liassica. The waterworks reservoir is not far below the 

 Carboniferous Limestone quarry of "Windsor Hill, and where the 

 lower beds of Lias would be expected to meet that formation; and 

 we here find the bastard or lower Sutton stone represented hj thick 

 crystalline limestones containing in abundance the cherty and other 

 pebbles, as at Sutton and Southerndown ; and so alike are the de- 

 posits that it is impossible to disting-uish between them ; and again 

 are repeated, excepting the corals, the organic remains of the Sut- 

 ton stone, Montlivaltioi being the only corals found at Shepton. 



Owing to the difi'erent character of the matrix of the stone at 



