Many times pitted stones are indeed work tables. And that’s because they are anvil stones, part of the toolkit for lithic bipolar production. Here are a couple of examples of anvil stones:
With nutting stones, in contrast, the pits are created first. With anvil stones, the pits result from usage. Nutting stones were apparently made with different size nuts in mind. The reason they are often interpreted as Archaic, at least here in the Northeast, is archaeologists have described what they call “Mast Forest Archaic”, where people made nuts from such trees a staple of their diet.
Here are a couple of nutting stones:
The one thing that troubles me about the stone in this thread is that some pits are positioned in a way that would make it awkward, perhaps impossible, to allow the stone to lay flat for easy use as a nutting stone. The second photo in the initial comment illustrates that problem. Why would a nutting pit have to be positioned for use with the stone positioned on edge? Perhaps the pits are manmade, but, if so, it would seem to be a very inconvenient shaped stone for such usage. I guess it can’t be ruled out, as I see the “on edge” stone is upside down in the photo....