Evidence of old homesteads found on our property

Look what I accidentally dug up on the farm today. I believe it's a very old mill stone for grinding corn or wheat.

I was digging to make a small pond near one of our springs when I found it. I'm sure it's from one of the old homesteads that were on our property. We had a neighbor who was 92 when he told us that each spring on our property once had a cabin near it. Now, this was so long ago that he didn't remember it, but he remembered his father telling him about it.

Since my neighbor mentioned all the old homesteads that use to be on our old gravel road, I have found evidence of this at three of our springs. We found an old fireplace lentel at one spot and I dug up several hand sawn pieces of lumber and broken pieces of cast iron pots at another site and now this mill stone. They are the only remenants of the old cabins from the early to mid 1800's here.

Some of these sites could be much older. Our neighbors have the original foundation to one of the oldest houses in the county which was built in 1799 on their property.

I'm guessing at what this is, but I can't imagine it is anything but a mill stone that broke and was tossed aside. You can see that the outside circumference is worn smooth and their are no grooves on the top or bottom which are also not worn flat. With a little digging I found that many mills were vertically placed to use their edge instead of the larger sides.

Below is the old lentel stone that went over the fireplace in one of the old homesteads. It was the same neighbor that showed us where it was located. Now it's our front porch step.

If you have any ideas or other information on what I think is an old mill stone please let me know.