186 
SUSSEX MARBLE. 
pillars to be factitious, stone of the very same sort 
with that they were composed of, in the neigh- 
bouring quarries.” 
Numerous examples of the durability of this 
limestone have been noticed above ; yet, from long 
exposure in damp situations, it undergoes decom- 
position, and the petrified testacea may then be 
extricated almost entire. The specimens hereafter 
figured, are examples of this kind ; and the slab 
delineated, p. 184. is of the most compact and beau- 
tiful variety that occurs in the south-eastern divi- 
sion of the county. 
Mr. Young observes, that this limestone affords 
a very valuable manure, equal to chalk. 
The shells belong to the genus Paludina, the 
recent species of which inhabit fresh water ; and 
they are associated with the shelly remains of a 
minute crustaceous animal of the genus Cypris 
( C. faha, Min. Conchology, pi. 485.) that occur 
also in a freshwater limestone in France.* The 
Sussex marble has been found in almost every 
part of the Weald clay ; from Laughton, near 
Lewes, to near Pet worth, Kirdford, Newdigate, 
Charlwood, south of Tilvester ITill in Surrey, and 
at Bethersden in Kent. 
In some localities the clay, alternating with the 
marble, contains the remains of cyclades, and other 
shells too imperfect to be determined. At Shipley, 
near West-Grinstead Park, in sinking a well in the 
Weald clay, masses of broken spiral univalves 
(apparently ])otamides') and cyclades were found at 
the depth of thirty feet ; and layers of the same 
if 
Description (icologu|ue dcs Environs de Paris. 
