

THIi! 





QUARTERLY JOURNAL 



or 



THE GEOLOGICAL SOCIETY OF LONDON. 



Vol. LXXIII 



FOR 1917. 



1. Fourth Note on the Piltdow^^ Gteayel, with Evidence of 

 a Secois^d Skull or Eoastheopl's dawsonf. By Aethur 

 Smith Woodward, LL.D., F.K.S., V.P.G.S. With an Ap- 

 pendix by Prof. GRAFTOJf Elliot Smith, M.A., M.D., F.R.S. 

 (Kead February 28th, 1917.) 



[Plate L] 



The Piltdown gravel has already been well described by the late 

 Mr. Charles Dawson,^ who pointed out its variable character and 

 concluded that its two lower layers at least could not be very dif- 

 ferent in age. '2 Further extensive excavations last summer round 

 the margin of the area previously explored, tended to confirm this 

 impression, and to show that the whole deposit is a shingle-bank 

 which may have accumulated within a comparative^^ short space 

 of time. The lenticular patches of the dark-brown ferruginous 

 gravel proved to be even more variable than before, and they were 

 seen to j)ass both into the sandy clay below and into the less clayey 

 deposit above. Large flints and waterworn pieces of Wealden sand- 

 stone were still observed scattered irregularly through the liner 

 material. The characteristic ' subangular flints ' were also found 

 at intervals in the basal sandy clay. More interesting, however, 

 was the discovery in this layer of numerous large elongated flints 

 and pieces of Wealden sandstone, witli their long axis more or less 

 nearly vertical. The evidence of Hood-action thus became complete. 



1 Q. J. G. S. vol. Ixx (1914) p. 82 

 - Ibid. vol. Ixxi (1915) p. 147. 



Q. J. G. S. No. 289. r 



