I found this stone on a beach of the Mackinaw River. Edges appear to be worked.
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Charl, very nice link! Also "They date to all culture periods." It is impossible to date a knife of this nature to a culture or time period, unless it is found in context with other artifacts. It can with relative association, to a site specific culture site, but is not considered fact.Love flake tools. That's a nice flake knife. Similar to what's shown at the link. They date to all culture periods.
http://ksartifacts.info/14RC424/14RC424-5 unifacial flake knife.jpg