68 



MARION EXPEDITION TO DAVIS STRAIT AND BAFFIN BAY 



The section eastward from jNIount Blow Me Down, 50 miles south 

 of Aiilalsivik, is restricted to the continental platform. The sedi- 

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

 sample 24, contain about 25 per cent of cla}^ and colloid. Sample 27 

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

 is a normally sorted fairly fine-grained silt. Similarly sample 1 



FKiUItE 49 



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

 Peninsula is a fine-grained silt. 



Frosting of sa/nd 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 



