80 
UPPER CHALK. 
line of coast, Ammonites of a large size, Plagio- 
stoma, Terebratulae, Ecliinites, and other produc- 
tions of the chalk, may he obtained. 
The sections in the interior of the country are 
entirely artificial : of these, the following are the 
most interesting that occur in the south-eastern 
part of the county. 
Holywell quarry, near Eastbourne, contains 
Ecliinites, Plagiostoma, Inocerami, Terehratute, 
the remains of Eishes, &c. 
Alfriston chalk-pit ; remarkable for crystallised 
carbonate of lime of considerable purity. 
Cliff Hills. The pits formed on the sides of 
this insulated portion of the chalk hills, produce 
a great variety of fossil shells and zoophytes, the 
remains of fishes, and the vertebras and bones of 
unknown animals. In some of these quarries, after 
a recent fall, the chalk presents a remarkable 
appearance ; the newly exposed surface is of a 
brown colour, and uniformly marked with fine 
vertical striae, giving to the mass a fibrous appear- 
ance. Small conical portions of the chalk some- 
times partake of the same character, and some 
specimens closely resemble calcareous fossil wood. 
In every instance, however, this structure is con- 
fined to the surface, and does not affect the interior 
of the chalk. In all probability it has been pro- 
duced by a subsidence of the strata, which caused 
impending danger, a deep chasm hail formed at some distance from the 
edge of the cliff, over which lie liad escaped but a few moments, before 
the mass of chalk upon which lie hail been standing, to the extent of 
300 feet in length, and eighty in breadth, fell with a tremendous crash 
into the sea. (Teologicnl Tran.sactions, vol. ii. p. 191. 
