ENGLACIAL ROCK -DEBRIS. 
77 
Below the hill D 4 the chasm between ice and rock is only about 50 feet deep 
and some 30 feet wide. The lower 20 feet of the ice-cliff is heavily charged with 
rock -debris of all shapes and sizes. Bounded and apparently water-worn boulders 
up to 12 feet across are exuded from the ice, together with fine sand and mud. 
Fig. 42. — The Dark Band of Ice-without-grain, below Normal Glacier-ice, 
AT THE FOOT OF KNOB Head. 
The sun is wasting the cliff away so rapidly that a lateral moraine is appearin 
below the general level of the glacier, and a small stream flowing along it is 
O O' O O 
carrying away the finer material which is being dropped into it by the rapidly 
thawing ice. 
O 
‘ OQ 
