Artifact or Geo?

[DemonCatSpaceStar]

Hello, got in a new feeder creek off a river & found what looks like it could be a grinder or something but I think its sandstone? It fits the hand & is shaped for a hand & Simi flat on the bottom. I'm just wondering if its an artifact or geofact?

I know the other is a fossil but I thought you might enjoy it, one of the biggest I've found.

Thanks for looking,

 

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[Indian Steve]

I would call the round one a hammerstone.

 

[sawmill man]

Your round piece dos have that very interesting look. i would probably hang on to it.

 

[arrow86]

Looks like a discoidal

 

[Old Pueblo]

The photo at the far right looks like it could be a mano, but if its not like perfectly smooth on that side its nothing. The other thing is weird. Definitely something I would add to the rock collection out back. Nice find.