TILVESTER HILL. 179 
6. Grey sand, with veins, and lenticular masses 
of chert : thickness five feet. * 
7. Sandstone, with veins of ironstone : tliickness 
four feet. 
8. Chert in layers, alternating with sand and 
marl : thickness twelve feet. 
9. Grey, green, and red mottled sand : thick- 
ness two feet. 
10. Pale yellow sand. 
11. Diluvial loam and rubble. 
The fullers’-earth pits of Nutfield, near Bletch- 
ingl}', so celebrated for magnificent specimens of sid- 
})hate of barytes, are situated in the range of Shank- 
lin sand liills, of which Tilvester Hill is a part. 
Organic Remains. — In some parts of England, 
the Shanklin sand contains a numerous and highly 
interesting assemblage of organic remains ; but in 
Sussex, fossils rarely occur, and Parham Park, 
and its vicinity, are the only productive localities 
at present known. Casts of univalves and bivalves, 
particularly of trigonia', gervillia', and rostellarige, 
are there found in profusion, in the indurated blocks 
of ferruginous sand.f 
Many new species have been discovered by ]\Ir. 
Martin, in the middle and lower group of sands in 
tlie vicinity of Pulborough : among those for which 
I am indebted to his liberality are Mga mandihulay 
Trigonia spinosa, Nucula impressa, Mptilus eden- 
tulus, Pkoladomya, Lenia, Lucina, Modiola, &c. 
* The cliert in this bed, like that of Western Sussex, occurs in large 
lenticular blocks in the sand, and not in regular horizontal layers. 
’ f Those genera and species which have been determined are men- 
tioned in the catalogue : ammonitce and tercbratulas are said to occur 
in the sandstone west of the river Arun. 
N 2 
