SOME GEOLOGICAL AND PREHISTORIC RECORDS. 277
single flake, or anything else of interest. But a boy scout on
camping holiday picked up an implement on the gravel heap
without knowing what it was, and this is now in my possession.
It is of a rather narrow pointed form 83/4 inches long, in mint
condition, unabraded and undamaged, with the first faint begin-
ning of ochreous patination. At the butt end the sharp edges
are removed by light battering for comfort of hand-grip. It
shows one frost crack which may extend, as I have known
implements in my collection fall in half from this cause without
being touched.
The following is a generalised section from different parts of
the workings :—
7. Surface soil, 9 inches to 1 foot.
6. Loam, up to 5 feet, but usually much less.
5. Line of former land surface.
4. Land-wash (or solifluxion), unstratified loamy gravel,
about 8 feet. Many of the flints, particularly towards
the top, are frost-shattered in place, the pieces remaining
unseparated. Many also show bluish-white surface-
soil patination.
3. Line of former land surface.
2. Boulder Clay, 3 feet, much weathered and decalcified
to a brown loam to a variable depth from the old land
surface 3.
1. Well-stratified calcareous sand and fine gravel, seen
to a depth of six feet, quite typical of the Glacial sands
of the district.
On general lines of correlation the land-wash gravel, 4,
probably represents the Ponders End stage when tundra conditions
prevailed. It is similar to the "earthy gravel" or "stony
loam" of Pledgdon previously referred to, which yields con-
temporary Late Levallois implements, as also do the Ponders
End deposits themselves.
The Wallbury implement agrees in technique with the final
Acheulian of La Micoque type. It shows a slight but unmistak-
able tendency to the peculiar curved main axis of La Micoque
forms, so that this type is adapted to delivering a stroke like
that of a pick-axe.
Although there is no direct evidence and one cannot be sure,
it would thus appear that the implement would be at home
on the lower buried land surface, 3 in the section. In any case,
it seems to have been a casual loss of a wandering hunter, as
I could find no trace of an occupation site.