STRATIGRAPHY OF THE CRAG. 



83 



1. Sutton and Ramsholt. — Zones a, b, and c. 



The lowest zones of the Coralline Crag were exposed only in the long since 

 disused pits at Sutton and Ramsholt. The old pit on Mr. Colchester's farm at 

 Sutton, south side of Sutton Farm Hill, showed in 1860 the following section :^ 



Zone d. 





Surface soil ....... 



White marly sands with seams of Cyprina [= Arctica] 



Ditto with Mya and Bryozoa in lower part, and Cardita, Astarte, Anomia, 



and Venus common in upper part 

 [This bed is stated to have been rich with Foraminifera] 

 Bed of comminuted shells, with single valves of Cyprina [= Arctica], 



Pecten [= Chlamys], Cellepora cxspitosa, &c. 

 Bed of phosphatic nodules, with Cetacean and other Mammalian remains 



and foreign boulders ..... 



[Nodule-Bed.] 

 London Clay. 



I'O" 



•17' 0" 



The Ramsholt pit was correlated with part of bed c. 



2. Broom Hill. — Zones d and e. 



Pit near the Keeper's Lodge, one mile west of Orford Church. 



The following section is given by Prof. Prestwich : " 



Surface and drift soil ...... 



Zone e. Yellow sand, full of Fascicidaria, AlveoJaria, and Cellepora ; few shells 



Sandy bed with comminuted shells, thin bands of tabular limestone, 

 layers of large and entire shells, and a few Bryozoa. The lower bed 

 is full of fine entire Cyprime, Thraciai, Diplodontie, Terelratidie, and 

 Carditx, often double ..... 



3'0" 



7'0" 



15' 0" 



The bed d, so far as I have seen on the many visits made to this jDit, must have 

 been somewhat lenticular and have thinned out, as it does not now (1894) exceed 

 10 to 12 feet in thickness. 



Foraminifera are abundant in this section in both zones, as the lists appended 

 show. In zone d, in addition to those forms common to most Coralline Crag 

 exposures, Poli/stomella crispa. is perhaps the most common, together with fine 

 specimens of P. macella. Some of the Polymorphinse, as Polymorpliina froiidiformis, 

 P. complanata, P. comjrressa, and P. gibba, are very large and well grown ; and the 

 same remark applies to Pulvinulina repanda. Cassidulina Jxvigata, not usually a 

 common form in the Coralline Crag, is also fairly plentiful in this zone. In zone 

 we notice the same abundance of Polystomella crispa, large and well developed. 



1 Prof. Prestwich, ' Quart. Journ. Geol. Soc.,' vol. sxvii, 1871, p. 117. 



2 Op. cit., p. 122. 



12 



