File:The Quarterly journal of the Geological Society of London (13365410193).jpg

1850..
PRESTV/ICH ON THE LOWER TERTIARY STRATA,
265
beds of Woolwich as well as the mottled clays are entirely wanting.
Still the physical or palseontological characters are such as to warrant
our considering as the basement bed of the London clay the twenty
feet of sands immediately underlying the London clay, although there
is here no passage between them. This bed is well exhibited in the
centre of the cliff east and west of the ravine at Bishopstoke, two
miles east of Heme Bay. (See fig. 11.)
Section near Heme Bay.
Brown and yellow clay, more or less mixed with
ochreous flint gravel.
London clay ; upper beds of a brown colour, and
with a few small septaria covered with vermiform
impressions, passing down into laminated dark
grey clay, more or less sandy, with carbonized
vegetable matter. Traces of Ditnipa plana and
of two species of Nummulites occur in the lower
part of this clay ; other fossils are extremely scarce.
r\. Thin irregular seam of green sand ; feiTuginous
clay and a few round flint pebbles, 2 to 3 inches.
2. Very light yellow sands with tabular con-
creted masses of sandstone and iron sandstone ;
these are frequently overlaid by a mass corre-
sponding in size of dark clay; very friable
shells are irregularly dispersed throughout this
bed in small layers and in patches; on the
under side of the blocks they are particularly
abundant, casts chiefly. 3 & 4. Small flint
pebbles with a very irregular series of thin
beds of clay and of ferruginous sandstone full
of casts of shells. Teeth, vertebrae and bones
of fishes of frequent occurrence.
d. Light greenish clayey sands ; upper surface worn
and indented by the pebble bed above. Beneath
are some very fossiliferous clayey sands.
Organic remains of '^ c,'
A start e.
Buccinura junceum, Sow.
Cardiura nitens, Sow.
Plumsteadieuse, Sow.
, n. sp. a,.
Cerithium variabile, Denh.
Cytherea obliqua.
ovalis, var. ?, Sow.
Cytherea or Cyprina, a large gibbous sp.
Cyprina Morrisii, Sow.
Corbula revoluta, Sow.
Fusus tuberosus ?, Sow.
~, n. sp.
Modiola.
Natica labellata, Lamk.
in the Heme Bay cliff's.
Natica glaucinoides, Sow.
Hantoniensis, Pilk.
Nucula margaritacea, var. j8, Desk.
, longer sp.
Ostrea, small sp.
Pectunculus brevirostris, Sow.
Pluiiisteadieiisis, Sow.
Pleurotoraa comma, Sow.
, a second sp.
Pyrula.
Rostellaria Sowerbyi, Mant.
, n. sp. large and striated.
Scalarja.
Vertebrae, bones and scales of fishes.
Teeth of Lamnae.
The estuary species, it will here be observed, have almost entirely
disappeared, and we have a fauna presenting a very close analogy
with that of stratum " c" at Sonning Hill near Reading and Claren-
don Hill near Salisbury. Still at Heme Bay, and more especially at
Boughton and Upnor, the fauna differs in some measure from the
one which I consider to be synchronous with it to the westward of
London. The bed itself also appears more distinctly separable in
mineral character from the London clay.