NAZEING STAGE IN THE LEA VALLEY 111
Seeds of certain other characteristic plants of this stage have
not been found up to the present but this is probably due to
the limited habitat represented by the deposit,
SUMMARY
In addition to the remarks which summarize the previous
paper the following suggestions are put forward :
a. It is now very clear that the two subdivisions of the
Nazeing Stage are, at Fishers Green, narrowly confined within
two distinct channels, as is the case farther south. The con-
ditions which existed in the type area appear to be of local
significance only.
b. Although the Charophyte Marls of the "M" Substage
can be readily recognised, they exhibit marked differences from
place to place. The writer is now satisfied that these are facies
differences.
The author wishes to thank the Ham River Grit Company
Ltd. for permission to visit the pit, members of the South
West Essex Geological Group for assisting in the routine work
of augering, and Mr. H. G. Eden for making the drawing for
the text figure.
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.
GODWIN, H., 1956. The History of the British Flora.
Cambridge.
Hayward, J. F., 1957a. Certain abandoned channels of Pleis-
tocene and Holocene age in the Lea Valley,
and their deposits. Proc. Geol. Assoc. 67, 32.
1957b. The Nazeing Stage (Pleistocene) in
the Lea Valley. Essex Nat. 30, 29.
1958. The molluscan sequence in the Lea
Valley. Journ. Conchology. 24, 329.