20 Geology. 



small number of far- travelled rocks, some of which can be traced 

 right across the Thames Basin and beyond. Mr. A. L. Leach and 

 Mr. R. H. Chandler have collected several of these, and slices cut 

 from them are at present under microscopical investigation. 



The best section is that shown at Wansant Farm, near Crayford 

 Station. It is as follows : 



Gravel with Implements, 10 feet. 

 False-bedded sands and gravel, 20 feet. 

 Unstratified gravel, 10 feet. 



Messrs. Hinton and Kennard (14) class the implements found here 

 as of Acheulian types. For further information see F. C. J. Spurrell, 

 Excursions to Dartford Heath, Proc. Geol. Assoc., vol. XIII., 

 p. 70, and vol. XVIII., p. 165. 



There are also sections in the High Terrace Gravels near North - 

 fleet, at Milton Street, Galley Hill, etc. 



Some few years ago a most important section at Milton Street, 

 about 100 feet above O.D., was described by Mr. H. Stopes. Large 

 numbers of NERITINA FLUVIATILIS, etc., were found associated with 

 a Pleistocene fauna and worked flints (15)- 



The finding of a human skull, etc., associated with flint imple- 

 ments, at Galley Hill by Mr. R. Elliott, has been fully described by 

 Mr. E. T. Newton (16). 



The gravels in this area are composed principally of flint, but 

 pebbles of Bunter quartzite, quartz, etc., are far from rare. A 

 moderate amount of Lower Greensand chert from the Wealden area 

 is also present. 



Recently much valuable work has been done in this locality by 

 Mr. James Cross, of Camberwell, who has presented a much- 

 appreciated and extensive series of implements from the Northfleet 

 area to the Edinburgh Museum. Messrs. Hinton and Kennard class- 

 the implements from this locality as belonging to Acheulian 

 types (17). 



The Crayford Brickexrths, etc. 



The Drift deposits exposed in several sections between Erith and 

 Clayford have for many years been a source of great interest to 

 geologists. The Brickearth, with its associated sandy and pebbly 



(14) Proc. Geol. Assoc., Vol. XIX. 



(15) Journ. Anthrop. Inst., Vol. XXIX., pp. 3023, and Proc. GeoL 

 Assoc., Vol. XVII., p. 138. 



(16) Quart. Journ. GeoL Soc., 1895, Vol. LI., p. 505, and Proc. Geol. Assoc., 

 1896 Vol. XIV., p. 305. 



(17) Proc. Geol. Assoc., Vol. XIX. 



