32 
DILUVIAL DEPOSITS. 
The cka//c presents its usual characters ; and in 
various parts of its course is traversed by vertical 
and oblique veins of flint. 
The sand is very fine, varying from pure white 
to a light reddish brown colour. It disappears 
about a mile to the east of Kemp Town, where 
the succeeding deposit lies immediately upon the 
surface of the chalk. 
The shingle bed consists of pebbles, formed, 
like tlie present beach, of broken chalk flints 
rounded by attrition. It contains also water- worn 
blocks of granite, porphyry, slate, limestone, and 
of tertiary sandstone, breccia, &c. It occasionally 
envelopes masses of broken shells. The upper 
part of this bed is cemented together by calca- 
reous spar, of a light yellow or amber colour, 
forming a coarse conglomerate of a very singular 
appearance. * 
The Elephant bed is composed of broken chalk, 
with angular fragments of flint, imbedded in a 
calcareous mass of a yellowish colour, constituting 
a very hard and coarse conglomerate. It is not 
stratified, but is merely a confused heap of alluvial 
materials ; where it forms a junction with the 
shingle bed, a layer of broken shells generally 
occurs : they are too fragile to extract vdiole : 
they appear to belong to tlie genera modiola, 
mytilus, nerita, &c. It varies considerably in its 
appearance and composition, in different parts of 
its course. In the inferior portion of the mass, 
the chalk is reduced to very small pieces, which 
* A specimen of tins mineral is figured in Sowerby’s British Miner- 
alogy. 
