300 



MESSES. G. A. J. COLE AND J. W. GREGORY 



Fig. 1. — Map of the Variolitic Bocls of 31 on t Gcnevre. 

 Scale about 1 : 50.000 (| mile = 1 inch). 



BOUSBON 



The area included by the broken line — — - ' — , which is left 



open on the south, is occupied by the variolitic rocks. 



%•••.••'• 

 •.*•.•!• 



Variolite-tuffs. 



Intrusive porphyritic diabase of Le Chenaillet. 

 II Gabbro. 



= ~\ Serpentine. 



Brecciated serpentine. 



(Heights in metres.) 



i'-^Ti l 



