DRIFT-STAGES OF THK DARENX VALLEY. l4o 



leading from the high road up to Snag Farm, and at about ^ of 

 a mile from the high road. Mr. Crawshay has collected from this 

 locality 40 pointed and ovoid Pakicolithic implements, and 18 Hakes 

 and scrapers. Two ralieolithic specimens had jjreviously been found 

 near this spot by Mr. P. Norman *. Nevertheless they are rare, for 

 four of us, after a full hours search, only succeeded in finding five 

 indifierent specimens. These implements are of the " Hill " type, 

 and mostly stained a light yellov7 colour t- 



The stream of gravel at Pratt's Bottom and the upper Cray (fig. 2, 

 p. 131) descends the Cray Valley, and passes by the end of Snag 

 Lane to Green Street Green, where it is very largely developed. 

 Remains of the Mammoth, TichorhineHhinoceros, and the Musk Ox 

 have been found in the great pit on the Green, and in a side pit I 

 have discovered a few specimens of Pupa niarr/inata, but could find 

 no other shell qi. The level of this drift at the end of Snag Lane is 

 276 feet above O.D. The field up the lane where the implements 

 occur is on the level of 320 to 340 feet, or 48 feet higher, whilst 

 farther on the Red Clay-w^th-flints caps the hill at the height of 

 450 feet. AVe there have therefore the three levels of drift perfectly 

 well-marked. I doubt, however, "whether the Green-Street-Green 

 gravel is really a river-drift, and hope to describe it on some future 

 occasion. 



It is at the farther end of the Cray Valley, near Crayford, that 

 Mr. F. C. J. Spurrell found the remarkable spot where Palaeolithic 

 man worked, and fashioned the Chalk flints into shapes most conve- 

 niently adapted for his tools and weapons — a spot now covered by 

 30 feet of Mammaliferous brick-earth and drift §. It is to be hoped 

 that these discoveries will be folloAved up, and that further evidence 

 of man's early habitation at other places in the Cray ^'ailey may 

 be forthcoming. 



§ 6. The Brick-earths of the Darent Valley. 



These are few in number. The bed of most importance is the one 

 worked on the south side of Limpsfield Common, a short distance 

 from the gravel-jjit (c, fig. 5, p. 139). It lies in a slight depression 

 near the head of the present Darent Valley ;;, at a height of 470 feet 

 above O.D., or from 10 to 30 feet lower than the adjacent gravel- 



* These implements, together with the Mammalian remains from the pit at 

 Green Street Green, are now in the coUection of Sir John Lubbock at High Elms, 

 t Quart. Journ. Geol. Soc. vol. xlv. (1881)) pi. x. 



I iSo Palaeolithic implements haye yet been found in the large pit, though 

 careful search lias been made, but from this smaller pit on the other side of the 

 hedge Mr. Crawshay lias obtained five specimens. They are of a dark yellow 

 colour, very much rolled and worn, and seem to me derived either from tlie 

 Plateau drift, or from a high-level valley gravel such as that at Snag Lane. 

 One of the specimens was found at a depth of 16 feet, close on the Chalk. 



§ Quart. Journ. Geol. Soc. vol. xxxvi. (188U) p. 544. 



II It seems as much related to the Oxted Valley as to that of the Darent, but 

 subsequent denudation may have caused this, and in any case there is a close 

 connexion with the Limpsfield gravel. See also " Geology of the Weald,' 

 p. 194. 



