Hammerstone?

The next set of pics are of a rock that I think is a hammerstone. What do you think? There are obvious marks on the various points of the rock that show some kind of pecking, or hammering action.

What's this?

This set of pics are of a rock that seems to show some sort of scratches. I don't know if they were put there by a person or not. The other side of the rock just shows normal natural features. Here, take a look.

Here's the back.

Here's the scratches, again.

Mano ?

I've been wondering if the object in this next set of pics is a mano. For those of you that don't know what a mano is...

"Manos refer to the handstones used in conjunction with milling basins and metates for grinding seeds or grains into flour. They are common artifacts on many archaeological sites throughout Oklahoma. They were utilized over several thousand years, earlier for grinding wild plant products and later for grinding maize (corn)."

In other words you take a big stone, throw down something that needs grinding, take a smaller stone in your hand and start grinding.

The only reason I think the stone in the pics below might(?) be a mano is that the edges look ground down to me. They've been smoothed.

Anybody out there with knowledge of this stuff agree with me? Let me know.

This first pic is the end that is obviously broken.

Here are two pics that show the wear and tear of grinding.

I'll keep searching for the larger grinding stone called a metate. It's gotta be around there somewhere.