12 
GEOLOGICAL STRUCTURE OF SUSSEX. 
illustrate this remark, we may observe, that the 
firestone which separates the grey marl from the 
gault, at Southbourn, is altogether wanting at 
Hamsey and several other places ; but in these 
instances the grey chalk marl reposes immediately 
upon the gault, the relative position of the masses 
remaining unaltered by the absence of the inter- 
vening deposit. 
Before proceeding to a more particular examin- 
ation of the several formations, we present the fol- 
lowing tabular arrangement of the strata, which 
will render our subsequent remarks more intelligible 
to the general reader, and, with the assistance of 
the map and sections, convey a correct idea of the 
stratification of this county, and of the adjoining 
parts of Surrey Kent, and Hampshire. 
The Strata arranged according to their Order of Supeiyosition, commencing 
tvith the uppermost or neioest deposit. 
Formations. 
ALLUVIAL DEPOSITS. 
Subdivisions and Mi- 
neralogical Cha- 
racters. 
Organic Remains, Observa- 
tions, Sjc. 
Alluvium. 
The effect of 
causes still 
acting in this 
district. 
Tufaceous deposits. J 
S 
} 
Blue clay, silt, sand 
and gravel. 
Peat and subterra- 
nean forests. 
Sand, gravel, and 
comminuted shells 
drifted inland from 
the sca-shore. 
I 
Incrustations of tufa on moss 
leaves, &c. 
Trunks of trees, marine and 
freshwater shells of recent 
species. Bones of man, deer, 
and Cetacea. 
Trunks and branches of trees, 
leaves, hazel nuts, &c. 
Comminuted shells. Sec. 
Diluvium. 
The effect of 
causes no ■ 
longer act- 
ing in this 
district. 
I 
Clay, loam, and gra- I Bones and teeth of the horse, 
vel. i deer, and elephant. 
Chalk rubble and par- 
tially rolled flints. 
Sec. 
The same : jaw of a whale. 
Boulders and pebbles 
of sandstone and 
ferruginous brec. 
cia. 
} 
Siliceous sandstone, the grey 
wethers of the western 
counties. 
Localities. 
\ 
\ 
Springs near Pounce- 
ford, Folkington, 
and Tower Hill 
near Horsham. 
Valleys of the Arun, 
Adur, Ouse, and 
Cuckmere. 
Lewes and Pevensey 
Levels, Fclpham, 
Little Horsted, Is- 
field, Hastings. 
Cliffs near Shoreham. 
inniscriminateiy on 
> the surface and in 
) the valleys of the 
_ older formations. 
' Clifis from near Kot- 
I tingdean to Shore- 
ham. 
■ Summits and valleys 
of the Downs, 
Brighton, Falmer, 
Alfriston, Lewes, 
&c. 
