[GoLightly]

http://www.museum.state.il.us/exhibits/larson/glacier_maps.html

[ForGod'sSake]

Thanks for the maps, but they don't really help explain how these artifacts could be found, in effect, under a glacier. Implied, is the fact these "tools" would had to have been on the site before the glacier formed. The only thing that makes any sense is that glacier(s) actually ebbed and flowed during the last glaciation and these tools would have been left behind during a "warm" period when the glaciers retreated before advancing again. Maybe that's a given; I don't know.