PEESTWICH CEAG-BEDS OF StTEPOLK AND KOEPOLK. 



467 



Sir Charles Lyell, in his ' Antiquity of Man,' gives a list of the 

 plants from the Porest-bed, determined by Dr. Heer, they are : — 



Pinus sylvestris. 

 Abies excelsa. 

 Taxus baccata. 

 Primus spinosa. 

 Menyanthes trifoliata. 

 Nymphsea alba. 



Nuphar lutea. 



Ceratophyllum demersum. 



Potamogeton. 



Alnus. 



Quercus. 



To these Mr. Gunn adds rhizomes and fronds of Ferns. 



The insects have not yet been fully described. They include 

 several species of Donacia. 



The following affords a good general section of this series, lying 

 beneath the Boulder- clay, in this part of the coast. 



Fig. 37. — Section of the Westleton Beds near Mimdesley, 



a. Laminated grey clay without fossils. 



i?V?i^iS:^5Sf i. Sand and small gravel with freshwater shells, 

 c. Laminated grey clay. 



SgjS^^^^S d. Sand and gravel with fragments of wood and 

 5??S^^ffl^^5 marine shells : oblique lamination common. 



iSsA^^ «• Fine sand. 

 ^^^ ^^ffi f. Clay and gravel with Mytili and LimncB(B. 

 "^^S g. Laminated grey clay. 

 -^^k.^- ^^■^^ h. Coarse gravel. Elephant-bed. 

 Dark sandy clay. Forest-bed. 



> 2 -J 



':S« 



These beds may be followed, with few interruptions, to Trimling- 

 ham and Cromer. Mr. Gunn states that it is from these beds at 

 Bacton that the remains of two Whales were obtained ; and it is 

 probable that, as the Forest-bed is not exposed at Cromer, the Nar- 

 whal tusk and the remains of a Walrus found by Mr. King near 

 Cromer were also from the sand-and-shingie beds. 



The next point of interest is near Eunton Gap, where we again 

 find at the base of the series a bed of peaty clay full of the following 

 species of freshwater shells : — Bytliinia tentaculata, Valvata pisci- 

 nalis, V. spirorhis, Planorhis marginatus, P. fontanus, Limnma pa- 

 lustris, Paludina achatina, Pisidium ainnicum, P. nitidum, Sphcerium 

 corneum, Anodonta cygnea, Unio pictorum, U. margaritifer. Some 

 years ago Mr. Trimmer discovered in the sand and shingle between 

 this peaty bed and the Lower Boulder-clay, at Runton Gap, a bed 

 containing numerous Mya truncata and Leda mycdis in their natural 

 vertical position, with both valves perfect. The section is as shown 

 in fig. 38. 



This brings us back to the part of the cliffs described {ante, p. 460) 

 in the section on the Norwich Crag. The beds now lose their subordi- 



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