Vol. LXXIII. 



Paet 4. 



No. 292. 



THE 



QUARTERLY JOURNAL 



GEOLOGICAL SOCIETY. 



EDITED BY 



Vxxsonian in^f/ 



MAY 1 1919 



THE PEEMANENT SECRETARY. X^^Vo^^^j^eNf 

 [With Five Plates, illustrating Mr. S. S. Buckman's Paper.] 



Decembee 31st, 1918. 



LONDON : 

 LONGMAxNS, GREEN, AND CO. 



PARIS :— CHARLES KLINCK8IECK. 11 RUE DE LILLE. 

 BOLD ALSO AT THE APARTMENTS OF THE SOCIETY. 



Price Five Shillings, 



