Abstract
An AMS radiocarbon age of 33860 ± 330 BP was obtained for a partial tusk from a gravel pit on the northern flanks of Turtle Mountain, southwestern Manitoba. The tusk was not collected in place but was removed from a pile of spoils. Gravel in the pit is capped by till which is overlain by glacial lake silt and sand. The gravel was interpreted as an ice advance glacial deposit because it grades into overlying till and bedding is locally faulted and disrupted. It was hoped the age of the tusk would correspond closely to the beginning of overriding of the area by the last ice sheet (Late Wisconsinan). Because the age obtained is about 10000 years older than was expected, it appears the tusk may have been incorporated from older deposits, or may come from an unrecognized, Middle Wisconsinan-aged gravel which underlies the gravel exposed immediately below the till.
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