1 4 
THE CRETACEOUS ROCKS OF BRITAIN. 
A part of this succession can be seen on the scar west of the Wish 
Tower. The Chloritic Marl is a greenish glauconitic chalk, con¬ 
taining many brown phosphatic nodules, which are especially numer¬ 
ous near its base, where the rock is very green and sandy ; the 
upper part is grey and less sandy, though full of green grains. It 
contains many fossils (see list on p. 76), and Stanronema Carteri 
is not rare. 
The overlying Chalk Marl is soft, grey mottled with darker grey, 
and its lower part contains many of the Sponges which were formeriv 
called Brachiolites, but are now known as Plocoscyphici. Above this 
soft marl, which may be 30 feet thick, there is a layer of compact 
grey shelly chalk, containing scattered green-coated phosphatic 
nodules, then light grey chalk with large patches of bluish-grey 
succeeded by another bed of shelly chalk with green-coated nodules. 
The nodule beds are each about a foot thick, and there is about 6 feet 
of chalk between. 
These two nodule beds with firm grey chalk between them are 
seen again below Beachy Head, but are not well exposed in the 
cliff, for where they occur there are several faults. Mr. Hill, how¬ 
ever, found the chalk above them to be a firm, compact light grey 
chalk in thick beds about 18 feet thick, and containing Am. varians. 
Above this 50 feet can be measured of light grey chalk, with streaks 
and patches of bluish-grey, in thick beds, which the wash of the 
sea works out into ridges. These beds contain Am. [Acanthoceras] 
Mantelli , Am. [Acanth.] rotomagensis, Holcister subglobosus, and 
other fossils (see list, p. 76). Hereabouts, however, some chalk 
must be cut out by slips and faults, for below the Belemnite Marls 
there is only 20 feet of firm greyish-white chalk. Probably a thick¬ 
ness of 50 feet is wanting. 
The Belemnite marls are unusually thick near Eastbourne ; they 
are well exposed both in Holywell Bay and below Beachy Head. 
In the cliffs of the bay the marls are about 15 feet thick, and con¬ 
sist of several beds, which vary in thickness, colour, and character 
within short distances. On the eastern side they comprise an 
upper and lower band of bluish-grey marl, with a central course 
of lighter grey marl, which splits into large angular fragments. 
Near the water-course of the Pumping Station Mr. Hill took the 
following measurements : — 
<15 
-M 
05 
PQ 
Melbourn Rock —White nodular rocky chalk - 
/Smooth grey marly chalk - 
Firm grey marl divided into thin bed by seams of 
shaly marl - -- -- -- - 
Soft dark bluish-grey marl, passing laterally into 
grey marl ----- from 8" to 
Massive grey marl, with varying fracture, some¬ 
times angular, sometimes conchoidal - 
Bluish-grey marl ------- 
Firm white chalk passing up into the above. 
ft. in. 
10 O 
1 3 
2 6 
O 6 
7 6 
3 6 
