ALLUVIAL DEPOSITS. 
^23 
Incmsting springs exist also at Tower Hill, near 
Horsham, and at Tolkington, near Hatton. 
4. Sandy S^c. drifted inland. 
In Sussex, the effects of this operation are un- 
important : a few low banks along the sea-shore, 
and a ridge of sand and comminuted shells near 
the entrance of Shoreliam Harbour, being the only 
instances worthy of notice : but in other parts of 
England they have produced extraordinary changes 
on the surface of the country, covering extensive 
tracts, and burying churches, and even whole vil- 
lages, beneath mountains of sand, which have sub- 
sequently been converted into compact sandstone.* * 
ENCROACHMENTS OF THE SEA. 
The destruction and removal of extensive tracts 
of land on the Sussex coast, by the inroads of the 
sea, have been noticed in the earliest historical re- 
cords of the county. At the present time, the 
ocean, silently, but incessantly, is carrying on the 
into a fine spray, and dashed against the moulds of the medals, which 
are placed round the sides of the vessel : by this means excellent im- 
pressions are produced,— Vide Org. Rem. vol.i. p. 363. 
The waters of the Ouse also contain a considerable proportion of 
calcareous earth. A wooden pipe, which had for several years been 
used for the conveyance of water from the paper-mill at Lewes, had 
its interior coated with a very compact carbonate of lime, nearly O'F 
inch thick. The presence of a large proportion of calcareous matter 
in almost all the springs in Sussex, renders the goitre, or Derbyshire 
neck, very common among the female population. 
* Vide a most interesting account of a recent formation of sandstone, 
on the northern coast of Cornwall, by Dr. Paris ; Trans. Geological 
Society of Cornwall, vol. i- p. 4. cl seq. 
C I 
