208 
TILGATE FOREST. 
3. Clay and shale. 
4. White sandstone, and sand. 
Proceeding towards the west, we arrive at Tilgate 
Forest, and within an area of eight or ten miles 
in length, and three or four in breadth, the 
compact varieties of the sandstone have been ex- 
tensively quarried, the rapid increase of Brighton, 
rendering the repair of the roads that lead to that 
town, from the metropolis, a subject of the first 
importance. Before we enter into a detailed 
account of the more interesting localities in this 
tract, we refer to the section (in the plate) from 
Brighton to near Tilgate Forest, where the rela- 
tive position of the strata is distinctly shown. 
1. The Crag: the cliffs of Brighton. 
2. Chalk, forming the range of Downs. 
3. Firestone,! i , i i c 
^ , [ but obscurely seen on the surface. 
4. Galt, J 
5. Shanklin sand ; a fine section at Stone-pound 
gate. 
6. Weald clay, and Sussex marble ; at St. John’s 
common. 
7 . Emergence of the upper beds of the Hastings 
sands, at Taylor’s bridge. 
8. Tilgate beds, near Cuckfield, &c. 
If this section were continued still further north, 
we should find the white sands and sandstone, with 
fern-leaves, at Worth, near Crawley: then the 
ferruginous sand, with ironstone, &c. 
Although, as we have elsewhere remarked, the 
subdivisions of the strata under examination are 
so variable, that scarcely any two quarries j)resent 
precisely the same characters, yet a certain order 
