DILUVIAL DEPOSITS. 
S3 
gradually become larger in proportion to their 
height in the cliff: at length fragments of flint 
aj)})ear ; and these increase in size and number 
as they a})proach the upper part of the bed, of 
which they constitute the most coiLsiderable por- 
tion. These flints are more or less broken, and 
resemble those of our j)loughed lands that have 
been long exposed to the action of the atmo- 
sphere. 
In some parts of the cliff’, irregular masses occur 
of an extraordinary hardness ; these have been pro- 
duced by an infiltration of crystallised carbonate 
of lime. Large blocks of this variety may be seen 
on the shore, opposite to the New Sfeine, where 
they have for years resisted the action of the 
waves. 
This bed also contains water-worn blocks of sili- 
ceous sandstone, and ferruginous breccia. Small 
nodular masses, composed of carbonate of iron in 
lenticular crystals, interspersed with brown cal- 
careous spar, have occasionally been found at the 
depth of ten or twelve feet from the summit of the 
cliff’. The organic remains discovered in this 
deposit are the bones aiul teeth of the ox, deer, 
horse, and of the Asiatic elephant* ; these occur 
but seldom, and are generally more or less water- 
worn t; but, in some instances, they are quite 
* In April, 1822, a large molar tooth of the Asiatic elephant was 
discovered in Lower Rock gardens, in a well fifty feet deep ; and four 
very fine and perfect ones were dug up by the workmen employed on the 
foundation of the walls for the esplanade, at the Chain Pier, in 1831. 
f I have specimens of the teeth, found in a well fifty yards inland, 
at the depth of forty-six feet, in the Coombe rock, and immediately 
above the bed of shingle. 
D 
