MAEIOX " EXPEDITIOX TO DAVIS STRAIT AND BAFFIN BAY 65 



ence diameter ( 

 of this sami)le 



ffers somewhat from the median. Since the median 

 is 145 microns, the sediment must be a very well- 

 sorted, fine-ai-ained sand. On the other hand, sample 22, is a 

 poorly sorted. Hne-orained sand, as /<o is 7.25 and M is 73 microns. 

 In specimen 2 a ranae of only 1.87 times the reference diameter 

 accounts for 25 per cent of the sediment, but in sam])le 22 it requires 



Figure 48 



7.25 times the reference diameter to comprise 25 per cent of the 

 deposit. The latter sediment, therefore, is very poorly sorted; that 

 is, it contains much clay and much coarse sand or gravel. 



Skewness. — If only So and M are given, the relationship of the 

 reference diameter to the median is unknown. The coefficient of 

 skewness, which is a measure of the diss^mimetry of the size distri- 



