TILGATE FOREST. 
^209 
of superposition prevails in the distribution of the 
])rincipal masses, which order is never inverted ; 
til is is well illustrated in the quarry, represented 
in the frontispiece to the present volume.* 
The up])er part of the pit consists of, — 
1. Loam, from five to seven feet. 
2. Sand, and soft friable sandstone, of various 
shades of yellow, green, grey, and ferruginous ; 
eight feet. 
3. A bed of fine, compact, bluish-grey, calci- 
feroLis sandstone (^Tilgate gr?V)> imbedded in 
sand ; varying in thickness, from one to nine feet ; 
the lower portion a conglomerate. 
4. Blue clay or marl — the base of the quarry ; 
thickness unknown : wells are sunk in it, to the 
depth of seventeen feet. 
Of these strata, the calciferous grit alone requires - 
notice. It differs in a few particidars from that of 
“White Rock : ” — it is less homogeneous ; is gener- 
ally of a darker shade of bluish or gi'eenish grey ; 
occurs in masses that are more tabular, and the lower 
portions form a very compact conglomerate, en- 
veloping large rolled pebbles of variously-coloured 
quartz, jasper, and small ones of pure white quartz, 
and flinty slate. It also contains organic remains, 
in far greater quantities than the stone at Has- 
tings ; bones, more or less rolled ; teeth, &c., are 
to be seen in almost every fragment ; and the car- 
* This ancient quarry is now filled np, and the spot it occupied con- 
verted into arable land ; a method invariably adopted by the proprie- 
tors of the estates in the environs of the forests, &c. after the harder 
sandstones have been extracted. 
P 
