112
THE ESSEX NATURALIST.
ON A SECTION AT RAYLEIGH. ESSEX SHOW-
ING A TRANSITION FROM LONDON CLAY TO
BAGSHOT SAND.
By S. W. WOOLDRIDGE, M.Sc., F.G.S., and HERBERT C. BERDINNER, B.Sc.
With a List of London Clay Fossils by A. WRIGLEY.
[Read 28th February, 1925.]
(With One Plate.)
ESSEX has made comparatively few contributions to Eocene
geology, though rocks of that age cover a considerable area,
in the county. The Bagshot Beds of the area have recently been
re-examined, and have been shown to present features of interest.
In the course of that work their relation to the London Clay was
studied at several localities ; the purpose of the present note
is to describe a series of sections on the western edge of the
Rayleigh Hills, where this relation is clearly seen.
The Rayleigh Hills constitute the most easterly group of