120 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. 



of Bryozoa, includiug the Salicornaria sinuosa, which I found here 

 in greater abundance and more perfect preservation than at any- 

 other spot. It also contains dark green grains of silicate of iron," 

 dispersed and in seams. The globose Fascicularia and Alveolaria are 

 common in both e and /. 



In strong contrast with this lower bed is the overlying ferruginous 

 soft rock, which forms the upper part of this quarry. It consists 

 essentially of comminuted shells and of fragments of Bryozoa, and 

 often shows oblique lamination. This mass, which here is about 

 11 feet thick, is cemented together, partly by carbonate of lime, and at 

 this spot partly by the oxide of iron, and forms a soft and very porous 

 dark brown rock. Detached valves of Pectens and other shells, and a 

 considerable number of Fascicularice and Alveolarice are found entire, 

 together with remains of Crustacea and Echinodermata. This bed at 

 Sutton is but 11 feet thick, forming only the lower part of the 

 upper division of the Coralline Crag. It is more largely developed 

 in the neighbourhood of Sudbourne, where it attains a thickness of 

 20 feet. At Low Gedgrave there is a pit where it is nearly 30 feet 

 thick. This division of the Crag often presents numerous curious 

 instances of oblique lamination, and exhibits, in fact, a very in- 

 structive illustration of the frequent reconstruction of old shell- 

 banks. Altogether the series of beds at and around Sutton and 

 Sudbourne, especially some in the near vicinity of Sudbourne church 

 (as in fig, 3), are of the greatest interest. 



Fig. 3. — Pit 5 furlongs E.N.E. from Sudbourne Church. 



This division is generally very uniform in its composition. There 

 is a pit, however, at the corner of the two cross-roads, 6 furlongs 

 N.N.E. from Sudbourne Church, where the upper 6 feet consists of 

 finely comminuted shells, with a few Bryozoa. 



This completes the series of beds forming the two divisions of the 

 Coralline Crag. I have denoted them by letters, for the convenience 

 of correlation with the same beds in other parts of the district. 



The thickness of the lower division of the Coralline Crag, as proved 

 at Sutton, is about 47 feet, and that of the upper division, as it 

 exists in the neighbourhood of Sudbourne and Gedgrave, about 36, 

 making a total of 83 feet. 



Taking the whole together, the general section of the Coralline 

 Crag is as follows (fig. 4) : — 



