DISCOVERY REPORTS, VOL. IX 



PLATE VII 



45 



ABSENT 

 UP TO 5% 



6%- 10% 

 1 1 %— 30% 



LIMIT OF 0B5 N -5 



i i i i ' 



i'""F 



I I ''' 



65° 



GO° 



DISTRIBUTION OF MEDIUM GRAVEL, 2-5-4-5 mm. 



