Possible stone tool or natural weathering?

[Jack873]

My buddys parents had built a home in the mountains in central PA. My buddy and I were moving some piles of rock that were pushed out of the way so the builders had a place to put building materials. These piles consisted mostly of, if not all, large pieces of shale and as we started unloading his truck this rock caught my eye because it didn't look natural and it is definitely not shale. It doesn't look like it was broken, but worn/worked smooth with a small groove in the center(notice the color change) and a chip on the one end like it was used to hit something. It fits in the hand pretty well, too. I have never found a Native American artifact before so it peaked my quriosity. Through some research it looks like it could be a hammer stone. Any thoughts?

 

[old digger]

Your item does not look like it was utilized as an Native American tool.

 

[The Grim Reaper]

I see no evidence of it ever being altered or utilized by man.

 

[Jack873]

Ok, thanks guys. Thought I had something

 

[rock]

The reason we know it hasnt been worked is the cortex hasnt been removed you can see the natural cracks in the stone. Any stone that has cracks in it wouldnt of been used normally due to it would of shattered upon use. I will show you a Celt and you can enlarge the pic to see how smooth it is. This has been pecked and ground into shape. It has to be a solid piece of stone.