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now in a cañon the north wall of which was almost an absolute precipice The South wall was in some places almost a precipice in other places it sloped away at an angle of from 60 to 75° - The canon was not less than 1000 feet deep in some places not 500 feet wide. The bottom was a narrow V averaging some 20 feet wide - in some places not six feet - filled with huge boulders, broken masses of storm-fallen trees while