LOWER CHALK—ISLE OF WIGHT. 
83 
in containing but few fossils. Stratigraphically, however, it appears 
to represent the whole of the zone of Holaster suhglohosus, and not 
only a portion of it. At the summit is a band of grey marl, which 
clearly represents the Belemnite Marl, though no specimen of Acti- 
nocamax has yet been obtained from it. 
As regards thickness, the total amount in Culver cliff is about 
311 feet, but it decreases westward, and is only 161 feet in Compton 
Bay, the difference being principally in the zone of Am. varians. 
Stratigraphical Details. 
1. Chloritic Marl. 
We now give the sections and particulars upon which the above 
remarks are based, beginning at the eastern end of the island : — 
Section in Culver Cliff. ft. in. 
Chloritic 
i Marl. 
8^ feet. 
Sel- 
bornian. 
( 5a. Bluish-grey glauconitic marly chalk, with 
brown phosphate nodules and lumps of hard 
calcareous stone in two beds - - - 4 
5. Greenish glauconitic sandy marl, with an 
irregular layer of hard concretions at top ; 
many brown phosphates and fossils - - 3 
3. Layer of grey calcareous doggers, with a 
few phosphatised stones embedded in grey 
sand - from 6 inches to 1 
'£. Grey sand with an irregular surface, pierced 
by pipes and borings, infilled with dark 
green glauconitic sand; from 6 inches to 1 
1. Sand with concretions of calcareo-siliceous 
, stone (see Vol. L, p. 138). 
6 
0 
0 
0 
From No. 3 Mr. Bliodes obtained the following : — Hallirkoa 
agariciformis, Stauronema Garteri, and Pecten asper. The bed 
which we have numbered 4 at Ventnor is absent at Culver. From 
No. 5 : Plocoscyphia fenestrata, Stauronema Garteri, Pecten asper , 
Am. [Schloenbachia] varians, and many other fossils have been 
obtained. 
Passing now to the Under cliff, we come first to a quarry under 
St. Boniface Down, near Ventnor, and here the following section 
was very clearly shown in 1897 : 
ft. 
in. 
Chalk 
f Marl. 
Chloritic 
Marl. 
7 feet. 
'Chalk Marl ------- 15 
J Two beds of hard grey chalk separated by 
) 6 inches of marl ------ 2 
l Soft grey marl, slightly glauconitic - - 0 
'5. Firm greenish glauconitic sandy marl, full 
of phosphatic nodules and casts of fossils ; 
Ammonites abundant - - - - 3 
4a. Firm greenish sandy marl with some hard 
( concretionary lumps ; a few phosphates - 1 
4. Very glauconitic sandy marl ; no phosphates 
or Ammonites seen - - - - -2 
3. Layer of hard stony concretions with brown 
phosphatised crusts - from 6 inches to 0 
€ 
6 
6 
0 
3 
0 
9 
4219. 
¥ 2 
