Stone hammer?

[bob_G]

I found this while trout fishing back in 1969. Spotted it in the river, and dove in after it.
Any thoughts?

[Totsuwa]

Wow what a form! Sorry I can't help but I hope someone on here can tell you something about it. I will check back here because I'm dying to know what it is myself . I'm also going to keep looking for ya.

[Totsuwa]

Does it have any kind of edge on it? Or is it blunt?

[bob_G]

Totsuwa,
It has no edge.  The bottom is blunt and smooth.  BTW, I found this in central Ma, in the Ware River while trout fishing.

[Ron Kelley]

Hey Bob, Welcome to the forum. Glad you could join us.
It doesn't appear to be an artifact or altered by the hands of man. JMHO
If it had been crafted my ancient man you would see a pecked surface.

[bob_G]

Ron Kelley wrote:

Hey Bob, Welcome to the forum. Glad you could join us.
It doesn't appear to be an artifact or altered by the hands of man. JMHO
If it had been crafted my ancient man you would see a pecked surface.

  Thank you for the welcome. 
Ron, yea, I can see your point. and that's been suggested before.  But I always wondered how did that 'hollow' appear? Could that be a naturally occurring thing?  Seeing as I found it in a fast moving river, where it may well have sat for hundreds of years, could the running water have smoothed the surface some and in the process hide some of the evidence? 
Just my thoughts.

[Ron Kelley]

Hey Bob, Moving water aided by sand, pebbles, and other rocks does some unusual and interesting things to the shape of a stone. I have found dozens of stones with holes in them (all natural).

[rmartin]

I agree with Ron. I see no modification that would lead me to believe this is an artifact. Just how it was formed by nature is a mystery to me but stranger things have happened.

[oryancochran]

Looks like a bannerstone preform imo.