File:The Quarterly journal of the Geological Society of London (13365501125).jpg

1850.. WESTON ON THE DILUVIA AND VALLEYS OF BATH. 449
is strewed with drift-gravel (chiefly derived from No, 6), capped by
a reconstruction of the London clay, which might easily be mistaken
P Fig. 7. — Section in Blackheath Cutting,
7 feet by 15 feet.
«, a. Alluvium. b, h. Drift.
c, c. Coloured clay and green sand, derived from " No. .3," with fragmentary shells (d) from
" No. 4," and pebbles (e).
/. Ash-coloured sand with ferruginous lines and concretions.
for that bed in situ. In consequence of this drift, the sections made
by the stream are of little value, though occasionally the stream has
worn its way down to the true tertiary substratum.
Hence the Map cannot give the boundary-lines of the strata with
certainty on the low ground ; elsewhere I trust that it will be found
to be as correct as the scale permits.
3. On the Diluvia and Valleys in the Vicinity o/Bath,
By Charles Henry Weston, Esq., F.G.S.
.Abstract..
Mr. Weston met with beds or considerable masses of chalk-flint di-
luvium on the crest of Kingsdown, one of the hills forming the
eastern side of the Box Valley, about five miles from Bath. The
drift was in situ on the upper portion of the Great Oolite, and filled
up a trough or **gulley." With the exception of occasional masses
of Great Oolite, it consisted entirely of chalk flints with ferruginous
clay. Some of the flints were rounded and some were brecciated, while
others, although smoothed superficially, retained their original forms
of polypothecian organization so characteristic of the chalk formation.
Mr. Weston could detect no fossils in this deposit. The height of
these beds, determined by barometrical admeasurement, was found to
be 545 feet above the level of the river Avon. The oolitic rock on
which these drift beds are deposited is superficially much hollowed
and apparently waterworn ; its stratification is horizontal, and it is
traversed with superinduced cross joints and fissures. In a quarry