File:The Quarterly journal of the Geological Society of London (12960623404).jpg

PALEOLITHIC IMPLEMENTS AT CRAYFORD.
547
has been repeatedly noticed in
the Geological Society's Jour-
nal, I shall not further de-
scribe it.
This gravel contains palaeo-
lithic implements. Some years
ago I found a hache * in situ
in it, on Dartford Heath, which
is now in the British Museum ;
and this has been followed by
Mr. C. C. S. Fooks (of The
Bowman's Lodge, Dartford
Heath) obtaining, last year,
another from the same gravel,
not quite so deep, however,
and about 25 feet further
south. I have found a few
flakes, all bearing a general
resemblance to each other in
mineral character; and it is
from this gravel that I believe
some of the flakes that have
been found in the brick-earths
below have been derived.
It appears that the river
afterwards left this level and
descended not less than 180
feet (perhaps more than 200),
cutting a deep channel, of which
the cliff in my first section
(fig. \) is a result. When at
its lowest, the river must have
been comparatively a small
one. The river then began to
rise slowly until the Avater
attained, if it did not exceed,
its old supremacy.
It was during this rise that
the brick-earths were deposited,
some of which, containing ele-
phant remains, have been found
resting on chalk in the bed of
the Thames in Erith Eands,
about forty feet below the
datum line.
Then the water retreated
again, washing away much of
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• Pigurod in Mr. J. Evans's 'An-
  

cient Stone Implements,' p. 532.