84 
THE CRETACEOUS ROCKS OF BRITAIN. 
ft. in. 
Selbornian. 
/ 2. Firm yellowish-green glauconitic sand, piped 
with darker sand from above, “the piped bed” 
/Sand containing brown-coated stony con- 
V 
cretions - - 
Irregular layer of grey chert 
Concretions of calc, sandstone 
brown crusts 
Chert Beds below. 
about 
with thick 
1 
1 
0 
1 
6 
G 
O 
o 
If this succession is compared with that given by us in 189(3, as 
shown on the shore below Ventnor,* it will be found to correspond 
very closely, the corresponding beds being indicated by the same 
numbers. As compared with the Culver section, it will be seen 
that two beds, with a combined thickness of over 3 feet, have come 
in between Nos. 3 and 5. The highest bed. No. 5, might be called 
the Cephalopoda-bed, and it exhibits the same characters all along 
the Undercliff. 
The section at St. Lawrence Shute is important in showing the 
diminution of Bed 4, and is as follows : — 
ft. in. 
Cldoritic 
Marl. 
41 feet. 
Selbornian. 
'5. Glauconitic marl with Ammonites and plios 
phatic nodules - - - - - - 3 
4. Bather soft greenish-grey sandy marl, with 
( few nodules or fossils - 0 
3. Layer of phosphatised stony concretions, 
about as large as a cricket ball, and some 
t phosphates, 6 inches to 0 
'2a. Fine glauconitic sandy marl with an irre 
gular layer of stony concretions, - about 1 
2. Hard greenish-grey marly sand piped with 
{ darker material, and containing many Pecten 
orbicularis ------ 2 
1. Layer of compact calcareous doggers - - 1 
^ Firm grey sand with cherts - seen for 12 or 15 
0 
G 
9 
0 
0 
0 
0 
It will be noticed that about a foot of sandy marl with the stony 
concretions (which might perhaps be called cornstones) here 
intervenes between the “ piped bed ” and the nodule-bed, No. 3. 
At Binnell Point, about three-quarters of a mile west of St. Law¬ 
rence Shute, the junction beds are shown in a slipped mass, and 
here there is nothing to represent Bed 4, so that the nodule-bed (3) 
forms the base of the Cephalopoda-bed (5) : — 
ft. in. 
5. Glauconitic marl with Cephalopoda - - - 3 0 
3. Nodule-bed with green and brown coated lumps - - 0 9 
2a. Greenish-grey sand with a few scattered cornstone 
lumps at and near the base - -from 1 to 1 3 
2. Greyish-green sand with darker pipings —Pecten orbicu¬ 
laris and P. asper ------ 10 
* Quart. Journ. Geol, Soc., Vol. lii. p. 105. 
