Waves of sand and snow and the eddies which make them . Plate 42.—Twelve-foot snow-cap on a broken treeat Glacier House. 217. CLh 220 SNOW-MUSHROOMS AND CAHOTS 221 culty in dislodging them. The circumstance thatthe overhanging caps do not when overloadedbreak off close against the tree-trunk is due tothe fact that the material which has accumulatedduring many snowfalls is stratified, and that thestrata bend down steeply near the edge of thecap. Thus if there be an overloading at the rimor edge a small break occurs at once without anyextension of fracture to the main mass. Moreover,the dome-sha
Waves of sand and snow and the eddies which make them . Plate 42.—Twelve-foot snow-cap on a broken treeat Glacier House. 217. CLh 220 SNOW-MUSHROOMS AND CAHOTS 221 culty in dislodging them. The circumstance thatthe overhanging caps do not when overloadedbreak off close against the tree-trunk is due tothe fact that the material which has accumulatedduring many snowfalls is stratified, and that thestrata bend down steeply near the edge of thecap. Thus if there be an overloading at the rimor edge a small break occurs at once without anyextension of fracture to the main mass. Moreover,the dome-shaped top is so steeply inclined at itsmargin that an additional load of snow wouldreadily slide off. The photographs show clearlythe contrast between the smooth surface of theupper stratum of snow, bent into a dome shape,and the rough edges of the pendent strata below,where the snow breaks away. The tree-stumppedestals had generally a diameter of 2 feet, andthe caps were of the nearly uniform diameter of9 feet—/.^., the snow projected 3I feet all depth of the snow upon the pedestal was about4| feet. Perhaps t
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