456 



PKOCEEDIiraS OF THE GEOLOGICAL SOCIETY. 



Postwick, and Bramerton, eaoh pit presenting certain distinctive 

 palseontological characters. In future collections from these beds it 

 would be very desirable to keep the fossils of each pit and each bed 

 separate, as has been so well done by Mr. Eeeve for Bramerton. 



The pit near the Asylum at Thorpe exhibits the best-known 

 and most interesting section of the jS'orwich Crag. Mr. E. Fitch, 

 P.G.S., of Norwich, has made a very fine collection from this pit, 

 including a large series of Mammalian and Mollusean remains. The 

 former, which are common chiefly amongst or immediately upon 

 the basement bed of worn flints (x', fig. 28), consist of teeth and 

 bones of the following species * : — 



Mastodon arvernensis. Trogoiitlierium Cuyierf. 



Eleplias meridionalis. Arvicola. 



S''^''^' T -1 9 Bones of birds. 



Jiquus plicidens f 



Bos. Platax Woodwardii. 



Fells pardoldes. I^aia antiqua. 



Hytena antiqua. Vertebra3 and otolites of fishes. 



Cervus FalconerL Teeth of Shark. 



ardeus. Crab (claws of, notch in edge as Irr 



Lutra. Carcinus). 



The shells are found in a bed of white sand with seaims of small 

 flint-shingle, lying immediately over the basement-flints. The more 

 common shells are, Tellina ohliqua, T. lata, T. prmfenuis, Mytilus 

 edulis, Lucina horealis, Gardium edule, Mactra suhtruncuta, Mya 

 arenaria, Buccinum undatwn, Purpura Japillus, Natica catena'^,. 

 Cerithium tricinctum, Littorina litforea, and L. rudis. Many species 

 are very rare ; and doubt attaches to some unique specimens in the 

 older collections. Mr. Fitch's collection, which contains a typical 

 and distinct one from the Norwich district, consists of about 72 

 species of marine shells. They are included in the list of the Nor- 

 wich-Crag Testacea appended to this paper, which is taken chiefly 

 from the list drawn out by the late Dr. Woodward for Mr. GunUy 

 supplemented from my own and other collections; 



Fig. 28. — Thorjpepit, Norwich. 

 \ 



5. Ochreous and femiglnoxis 



sands and flint-shingle, with 



a layer of iron-sandstone, 



full of casts of shells at a;. . . 20 



3. Grey clay (Chillesford), with 



a few large worn flints ...1 to 1| 

 3'&2'. White sands, with seams 

 ) of gravel and patches of 



3 shells and comminuted 



} shells, with a layer of large 

 31 flints at base from 5 to 12 



^ At this pit the line of separation be- 

 ^' tween 3' and 2' is not well marked. 

 At Bramerton 3' & 2' are much thicker 

 Chalk, (nearly 30 feet), and the division into 

 separate beds more apparent. 



* In the revision of the mammalian remains I have been kindly aided by Mr, 

 Boyd Dawkins. 



