The type section was defined in 1994 by Meijer and Johnston in the "Devil's Gap" section south of Mount Costigan of the Palliser Range, north of Lake Minnewanka in Banff National Park.
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After a brief stop at Fort Edmonton, they were guided by Maskepetoon, the chief of the Wetaskiwin Cree, via Lake Minnewanka to the present site of Banff, Alberta where the Spray River joins with the Bow River; and then south up the Spray River valley where the reservoir now lies.