68 



MARION ' ' EXPEDITION TO DAVIS STRAIT AND BAFFIN BAY 



The section eastward from Mount BIoav Me Down, 50 miles south 

 of AulalsiA^k, is restricted to the continental platform. The sedi- 

 ments consist of fine-grained poorly sorted sands and, except for 

 sample 24, contain about 25 per cent of clay and colloid. Sample 27 

 in 855 meters of water, 150 miles off the southern coast of Labrador, 

 i^ a normallv sorted fairly fine-grained silt. Similarly sample 1 



FKiUltE 40 



on the slope into a depression 2,000 meters in depth off Cumberland 

 Peninsula is a fine-grained silt. 



Frosting of sand grains. — All the samples contain frosted sand 

 grains. The greatest amount of polishing occurs in the medium- 

 grained sand group (250 to 500 microns), but some of the coarse 

 and fine sands are frosted. The relative amount of polished grains 



