CGRG Bibliography of Canadian Geomorphology
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Author : Evans, S.G.
Date : 1989.
Title : Rock avalanche run-up record
Publication : Nature
Issue : 340: (6231)
Page(s) : 271.



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Abstract

During movement along its path, rock-avalanche debris can exhibit spectacular mobility in surmounting substantial topographic obstacles, in running up opposing slopes, and in the superelevation of its surface in valley bends in its path. In investigating the run-up at the Avalanche Lake rock avalanche located at 62 25 N, 127 15 W, in the uninhabited Mackenzie Mountains of the Cordillera of western Canada, I have documented a run-up that is both highly anomalous and the highest ever recorded. ... It involved the detachment of an estimated 5-100,000,000/cu m of Palaeozoic limestone along a remarkably planar bedding surface dipping at about 31 degrees S towards the valley .... Radiocarbon dating (by the Radiocarbon Laboratory of the Geological Survey of Canada) of four fragments of wood, one of which was collected by P.K. Kaiser and J.V. Simmons, yields a youngest date of 320 ±50 year before present. Using the calibration curves of Stuiver and Pearson, this date indicates that the avalanche occurred no earlier than 1450 AD

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Bibliography of Canadian Geomorphology