42 THE ESSEX NATURALIST
TABLE 2. The distribution of the sites mentioned in this
paper.
Acknowledgments.
The author is indebted to the following bodies or their rep-
resentatives for permission to visit sites, for facilities while on
the sites and for permission to publish this report: Middlesex
County Council, Messrs. J. D. and I). M. "Watson and their
resident engineers, The Lee Conservancy Catchment Board,
The Ham River Grit Co. Ltd. He also wishes to thank Mr. S.
Hazzledine Warren for critically reviewing the first section of
this paper and for his usual friendly co-operation, Mr. J. W.
Dandy for information concerning the Watsonian vice-counties,
and a number of friends for assisting in routine work of auger-
ing, etc. The drawings for the illustrations were made by
Mr. H. G. Eden.
References.
Allison, J., Godwin, H., and Warren, S. H. 1952. Late-
Glacial Deposits at Nazeing in the Lea Valley,
North London. Phil. Trans. Roy. Soc. Ser. B.
Biological Sciences, No. 632, p. 169.
Hayward, J. F. 1957. Certain abandoned channels of Pleisto-
cene and Holocene age in the Lea Valley, and
their deposits. Proc. Geol. Assoc, 67. 32.
Woodward, H. 1869. The Freshwater Deposits of the Valley
of the Lea, near Walthamstow, Essex. Geol.
Mag. 6. 385.