PLEISToCEN'E GFOLOGY of the THAMES VALLEY, 34I 



(69.) 1897. Kexnakd (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." Pivc. 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., vol. 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. 2S2. 

 (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. Mug., 



dec. 4, vol. viii., pp. 49-52. 



///. 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 tlie 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 

 1 ertiaries come on underneath it in considerable thickness, thus 

 carrying the valuable Chalk out of the range of the local 

 quarry man. 



ACCOUNT OF SECTIONS. 

 (a.) SockeWs 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. 



