Add to ORKG32 Alt [altitude] of avalanche back of Hutch 470 feet. Average slope 31°, extreme slope where has been spouted down narrow lane 36° [drawing: heavier blocks sorted out by momentum; sand & smaller chips here; greatest descent] These avalanches that are thus shot down narrow and rough-walled [slopes] slots are ground & rounded almost like moraine boulders. Fine dust is also formed thus like the dust of dried moraine mud. [Dust] of gullies in high Sierra thus formed. Channels of 33 snow streams, of rock streams, of water streams, of ice streams all different yet not always readily distinguished Trees cut off 100 ft above base tops falling upwards Some of old tops & old trunks to be seen [on Hutch avalanche]. When killed & how? Alt [...