Abstract

Prominent inactive alluvial fans, which characterize parts of the Bow River valley, Banff National Park, Alberta, were deposited in a distinct interval of 'post-glacial' time. The fans were nearly completely formed before Altithermal time 6000 years B.P., as indicated by the occurrence of Mazama ash in the upper part of one of the fan deposits. This information indicates that a large landslide at Johnston Creek occurred within the same interval of time.

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