File:The Quarterly journal of the Geological Society of London (13365219685).jpg

256
PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .Jan. 23,
clay of HampsMre \ritli that of the London district, I had occasion
to allude frequently to this basement bed in the Isle of Wight and
in the western part of the London district. In addition to the sections
of the central and eastern area of the London tertiaries, which did
not then come under notice, I pm-pose gi^'ing a few of the leading
sections I then alluded to in more detail than I could in a paper
which embraced a wider subject, and to which this point was only
secondaiy.
I will take separately the sections and lists of the organic remains
at each locahty, and afterwards endeavour to show their co-relation*.
To resume m the Isle of \M2;ht with the interesting section of this
bed at White Cliff Bay. (See fig. 1.)
Fig. \.— Section of a part of White ClifBay.
b . London clay ; dark brown and grey clay ; in de-
scending becomes mixed ^ith green sand. Fossils
scarce.
, Tabular septaria, with numerous fossUs.
2. IMised clay and green sand, like 4. 3. Dark
green sand, "full of the Ditrupa playia. 4.
Brown sandy clay, much mixed with green
sand, and passing downwards into a conglo-
merate with round flint pebbles, and partly
rounded pebbles of chalk and red clay. Con-
tains a few Ditrupa plana. 3 to 4 feet.
.c..
Ostrea, a large undetermined species.
Pectunculus brevirostris, Sow.
Pyrula tricostata, Desk.
Rostellaria Sowerbyi, Mant.
Teeth of Lamnaef.
Mottled clays — dark red (upper part of) .
The occurrence of pebbles of the underhung mottled red clay m
the lower part of the basement of the London clay " c " is a fact here
to be particularly noticed.
The organic remains found in this bed are as under : —
Cardium Plumsteadiense, Sow.
Corbula, a finely striated species.
Cytherea obliqua, Desk.
Ditrupa plana, Sow. sp.
Natica glaucinoides, Sow.
Traces of carbonized yegetables and
wood.
Passing over to the northern part of the Hampshire tertiary di-
strict, the only good section of this bed that I am acquainted with
was exposed in a cutting on the Railway at Clarendon Hill, three miles
E.S.E. of Sahsbuiy. (See fig. 2.)

• For an outline map of the tertiary strata, see Quart. Joum. Geol. Soc. vol. iii.
  

pi. xiv.
t I have omitted the name of the species, as I feel in doubt as to which of
Agassiz's species to refer it. It probably is the L. elegans, or there may be more
than one species. The same species accompany tliis bed throughout its entire