PRESTWICH CRAG-BEDS OF SUFFOLK AND NORFOLK. 



337 



section in association with other shells of the Chillesford series, such 

 as Cyprina islandica, Mactra ovalis, Mya truncata, Tellina obliqiia 

 T. iata, and T. prcetenuls, in sands resting tipon beds of the Re* 

 Crag. 



I have collected in these upper beds at Bawdsej^ cliff: — 



Astarte compressa. 

 Cardita scalaris. 

 Cardium edule. 

 Cyprina islandica. 

 Lucina borealis ? 

 Mactra solida. 

 Mya arenaria. 

 Mytilus edulis. 

 Pecten opercularis. 

 Pectunculus glycymeris. 

 Tellina obliqua. 



prsetenuis. 



Nucula Cobboldiffi. 



Buccinum luidatum. 

 Littorina littorea. 

 Nassa reticosa. 

 Natica catena. 



■ hemiclausa. 



Trophon antiquum, var. con- 



traria. 

 Turritella communis. 



Sphenotrochus intermedins. 

 Vertebrse of fish. 

 Teeth of shark. 

 Claws of crab. 



Owing to the presence of derived fossils, and the similarity of 

 lithological characters of this division in the Red-Crag district 

 proper, it will require special and careful search to determine its 

 fauna in this area. Most of the shells are probably in common ; but 

 the variation in physical conditions, independently of other circum- 

 stances, will be found, no doubt, to have brought in fresh species. 



Fig. 19. — Section in Chillesford brick-pit. 



Boulder-clay. 



Chillesford clay with 

 impressions of shells. 



t Chillesford sand re- 

 posing on Eed Crag. 



These sands are succeeded by laminated grey clays, the lower parts 

 of which are seen at ChiUesford-Church pit, but are better developed 

 at Chillesford brick-pit. The clay is there fossiliferous ; but the shells 

 are all in the state of casts and impressions in the clay. The fol- 

 lowing species are recognizable : — 



Area. Leda myalis. 



Cardium groenlandicum. Nucula tenuis. 



Cyprina islandica. Tellina lata. 



