PLEISTOCENE GEOLOGY OF THE THAMES VALLEY. 341
(69.) 1897. Kennard (A. S.) and Woodward (B. B.)—"The Post-Pliocene
Non-Marine Mollusca of Essex." Essex Nat., vol. x., pp. 101-103
and table
(70.) 1899. Hinton (Martin A. C.)—"Manganese in River Gravels."
Science Gossip, new ser., vol. vi., p. 146.
(71.) 1900. Hinton (Martin A. C.)—"The Pleistocene Deposits of the
Ilford and Wanstead District." Proc. Geol. Assoc, vol. xvi. (evidence
of estuarine conditions noted p. 280).
(72.) 1900. Hinton (Martin A. C.)—" On the Pleistocene Deposits of the
Ilford and Wanstead District, Essex." Essex Nat., wol. xi., p. 161.
(73.) 1900. Kennard (A. S.) and Woodward (B. B.)—"The Pleistocene
Non-marine Mollusca of Ilford." Proc. Geol. Assoc, vol. xvi., p. 282.
(74.) 1900. Johnson (J, P.) and White (G.)—"On some New Sections at
Ilford and Additions to the Fauna." Essex Nat., vol. xi., p. 157.
(75.) 1901. Newton (E. T.)—"British Pleistocene Fishes." Geol. Mag.,
dec. 4, vol. viii., pp. 49-52.
III. HIGH TERRACE DRIFT.
A detailed survey of the High Terrace Drift of the Grays
Thurrock Area involves the consideration of certain physio-
graphical features of a somewhat puzzling nature. We had
finished our examination of the eastern part of this Drift, the
physiography of which is described later, and had proceeded
somewhat with our work in the western district when it became
evident that a description of the latter portion was impracticable
in the present communication. Considerations of time and
space forced us to reserve our description of the western portion
of the High Terrace deposits until next year, when we hope to
publish a supplement to this paper.
EASTERN TRACT.
A large patch of gravel extending from Stifford and Grays
on the east, between Baker Street and Chadwell to beyond West
Tilbury and the confines of our district, forms the eastern tract
of the High Terrace Drift of the Grays Thurrock area. There
are, however, but few sections to be described in this sheet of
Gravel, perhaps owing to the fact that the Lower London
Tertiaries come on underneath it in considerable thickness, thus
carrying the valuable Chalk out of the range of the local
quarryman.
ACCOUNT OF SECTIONS.
(a.) Sockett's Heath. Surface level 90 feet O.D. A gravel
pit at Sockett's Heath shows about 16 feet of evenly bedded
gravel in which Palaeolithic implements are fairly abundant.