DEPOSITS AND ELEVATION. 31 



Tindistinguisliable worn bits of shell. It contains much- 

 worn fragments of the following species : — 



Pholas crispata. Trochus cinerarius. 



Mya truncata. Littorina littorea. 



Tapes decussata. rudis. 



virginea. littoralis. 



Cardium echinatum. Purpura lapillus. 



Mytilus edulis. Buccinum undatum. 



Modiola modiolus. Fusus antiquus. 



Ostrea edulis. 



Pecten varius. Balanus (3). 



pusio. Serpula. 



Patella vulgata. Clione-holes in bits of Ostrea. 



Every species occurs only in very small fragments^ that 

 pass the half-inch sieve and are very much worn — except 

 only Mytilus and Patella (which occur of adult size in 

 more or less sharp-edged fragments) , Ostrea (which occurs 

 as very old worn valves), and Littorina littorea (which 

 occurs either as very worn fragments, or whole_, full-sized 

 and very fresh, like the specimens from the superficial 

 clays lower down the hill) . A certain proportion of the 

 mussel-shells are filled with a hard substance most like 

 mortar. 



The bed lies under loam about a foot thick, and upon 

 the lower superficial clay with angular fragments de- 

 scribed above ; and, while it follows the general inclination 

 of that bed, it thins ofi* below and above, as seen along 

 the roadside within a space of lo yards. It has scarcely 

 any appreciable extension from the roadside backwards, 

 and does not appear at all 3 yards from the section, nor 

 on the other side of the road. There appeared to me a 

 sort of horizontal arrangement of the larger pebbles. 

 Of these a very large proportion (twelve to sixteen out of 

 twenty) were of white quartz, chert, or limestone, of a 

 nearly uniform size, about as large as a hen^s e^^. No 

 other sign of bedding was discernible. 



The shingle is certainly very beach-like, but it is pecu- 



