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Seriously?
View attachment 1274408
Not all round rocks were used. It takes a long time to be able to see the use wear on rocks you have to look at a lot of different examples to be able to see the wear and know if it was used. I collected rocks for years before I collected artifacts. Now its the best of both worlds all in one collection. None of those show me anything but natural.
Yeah, if the blonde colored area on the lower portion of the first rock is actual battered cortex/skin, and not simply a color change, then it might be a hammerstone. I don't see it with the second stone. But I'd be curious what usage you actually see on that stone, just to better understand why you think it's an artifact. Because it shows no usage at all in the photo. Not apparent to my eyes, at least...