Camping at Turtle Mountain

 
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Description: John A. Allan, southeast of Frank Slide and Turtle Mountain, Alberta, 1933 Canada's deadliest rock avalanche occurred at 4:10 am on April 29, 1903, when 30 million cubic metres of rock fell down Turtle Mountain and buried the eastern part of the town of Frank, killing 90 people. Between 1931 and 1933, Allan wrote three reports on the stability of Turtle Mountain for the Alberta Department of Public Works. He concluded that the main cause of the tragedy was the geological structure of the mountain. Source: University of Alberta Archives #79-23-1357
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