EXPLANATION OF PLATE V 
Kettle-Holes near Hidden Glacier 
Kettle-holes are ascribed to the melting out of ice masses that had 
been buried by the rapid accumulation of gravel or sand. In the 
cases pictured the burying material was* gravel washed from Hidden 
Glacier, and the ice masses were originally part of the glacier. 
The Upper Figure shows a fresh-formed example, the steep walls 
exhibiting the gravel deposit in section. It shows also the gentle 
terminal slope of the glacier, the smooth sculpture of its valley wall, 
and the mouth of a hanging valley. See pages 55 and 118. 
The Lower Figure shows a less advanced stage of the same phe¬ 
nomenon. After settling had commenced, the spot received a deposit of 
mud, and this mud was cracked as the settling proceeded. 
Photographed by G. K. Gilbert, June, 1899. Negatives nos. 371 
and 372, United States Geological Survey. 
