3 



Vol. LXXIII. No. 291. 



Paet 3. 



THE ; 



QUARTERLY JOURNAL 



OF THE 



GEOLOGICAL SOCIETY. 



EDITED BY 



I THE PERMANENT SECEETfieY^K,, < 



; [With Nine Plates, illustrating Dr. C. T. Trechmann's Paper.] ; 



NOVEMBEE 30th, 1918. 



LONDON . 

 LONGMANS, GREEN, AND CO. 



PARIb:— CHARLES KLINCKSIECK, U HUE DE LILLE. 

 BOLD ALSO AT THE AFARTMEKTS OF THE SOCIETY. 



Price Five Shillings. 



