DESCRIPTION 
OF 
THE MAP AND SECTIONS. 
The first section is by Mr. Murchison ; it illustrates the geology of the 
north-western extremity of Sussex, and part of Hampshire, and is referred to 
at p. 183. It gives an interesting view of the structure of that part of the 
country which forms the extreme angle of the great southern denudation of 
the chalk of England. 
The section from Brighton to Tilgate Forest is described at p. 208. 
That of Tilvester Hill, near Godstone, in Surrey, exhibits the beds of 
Chert of the Shanklin sand formation, p. 178. 
The sketch of the strata east of Cuckfield displays the details of the TVgate 
beds in that part of Sussex; vide p- 211 ; and that of the while rock, near 
Hastings, shows the characters and relations of the same strata in the eastern 
part of the county: p. 194. 
The clifi’s at Southbourn expose a section of the marl and Jirestone, and 
are described at p. 1 62. 
The section of the coasts of Sussex and Kent is that given by Dr. Fitton, 
in the “ Annals of Philosophy.” 
The plan of the strata from Tring, in Hertfordshire, to Newhaven, in 
Sussex, is taken, with but slight alteration, from the Geology of England 
and Wales, of Messrs. Conybeare and Phillips. 
The Map is intended to convey a general idea of the geological structure 
of the South-east of England. For the purpose of illustration, the lines of 
colours which denote the several formations are continued throughout the 
whole district ; for although in many places a stratum, or group of strata, may 
not appear on the surface through an extent of several miles, yet, if the situ- 
ation of the rocks be known in localities not far distant, the deposits are 
represented as continuous, although their course may be concealed by the 
superficial soil. 
The Alluvial deposits along the courses of the rivers are not marked ; on 
so small a scale, details could not be attempted. 
The important deposits at Brighton, which we have referred to the Crag, 
(see p. .SO, el seq.), are marked Diluvium on the map, and coloured green, 
and are seen to extend from llottingdean to near Littlehampton and 
Boanor.* 
The Tertiary strata, stretching along the coast from Bracklesham Bay to 
near Worthing, and their outlying portions at Castle Hill and Chimting 
Castle, are coloured brown : see p. 45. 
The Chalk, restricting the term in this instance to the white chalk and chalk 
7iiarl (for the lowermost members of the formation, the gall and the Jirestone, 
are marked separately), is coloured yelloio ; and is seen extending from Beachy 
Head to Hampshire, from thence across to Surrey, and returning to the sea- 
roast, at Dover. 
The Firestone, coloured red, and the Galt, blue, form a zone within the 
chalk hills. 
The Shanklin sands, distinguished by a jnnk colour, constitute a broad belt 
between the gait and the Wealdeii beds. 
The ICeald clay, coloured green, lies betw'een the boundary of the Shanklin 
sand and the Hastings beds, which are denoted by a ferruginous tint. 
Note. — It may be necessary to observe, that in the above (as in most geo- 
logical) sections, the altitudes of the strata are drawm on a much larger scale 
than their longitudinal dimensions : a method which is found indispensable 
to accommodate the plates to the size of the volume. 
* Not lii/rnor, as is erroneously printed at p. 30. of this volume. 
