Need help-stone with grooves and lines...

[autographcollector11]

This was supposedly found on a Mississippian era site-lots of tools were found.
the stone is somewhat abrasive-the surface is not extremely hard but notice the lines etched on the surface. They go on different directions and so appear to be quite random. I thought it may be glacial but does this look like it may be something used for something? Found in Illinois on private property.

thanks

 

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[rock]

Plow marks? Looks natural to me.

 

[autographcollector11]

Yeah- but The property has never been plowed-pretty much the way it was centuries ago......

 

[The Grim Reaper]

Where are you from? It could be grooves from being moved by a Glacier.

 

[Jon Stewart]

Hard to say but it could have been used as an abrader for flintknapping arrowheads.

 

[flinthunter]

Looks like glacial grinding.

 

[Treasure_Hunter]

Doesn't look like abrader..

 

[Peter Iredale]

Likely natural