Need help in ID'ing

[BH330]

New to this community, would appreciate any feedback. Have no idea if this is an artifact or a just an interesting rock. Found on Cedar River sandbar in southern Black Hawk Co IA.

 

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[quito]

Looks natural to me, no sign of workmanship at all.

 

[Indian Steve]

Sorry, Just a rock

 

[The Grim Reaper]

I agree. It shows no signs of being altered or utilized by man.

 

[unclemac]

that is a spall from what looks like basalt. it is very common to see that form in nature. yours is also very water worn.