Really cool scraper or preform?

[Arrow1492]

Found in Wisconsin years ago. The material appears very low grade-I'm guessing a type of chert. Based on the pics, preform or scraper? Any idea of possible age if a preform?
One side looks like it has a lot of mineral deposits.....

 

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[Arrow1492]

You know-could also be a chopper I guess?

 

[DigIron2]

I cant help much, but would guess some kind of chert? Its a nice big piece. I like how the flaking is well defined on it.

 

[rock]

I think its a hafted end scraper myself probably attached to a handle by the notches its a uni faced tool