This is an artifact I found on a sandbar in the middle of the Great Miami River, near Cincinnati, Ohio.  I think it may be a pendant or amulet of some kind from the time of the Adena culture, which would mean it could  be 2,000 years old! I cranked up the contrast on this photo to try to reveal some surface details.

You can’t really tell from the photo, but there are a few engraved gooves on each side of the object. The hole was obviously drilled by a flint or stone drill.   I plan to take this somewhere soon to get an expert opinion, but it really does seem like it was created to be a pendant.  One of the bottom corners is broken, but you can still tell it must have been carefully crafted.   It is almost exactly 1 1/2 inches long and 1 inch in width.