Thought I would throw this out there and see what you think. Pictured below is a "rock" I found fishing in western NY state. It's about 5 inches in diameter and is unusual in it's near perfect roundness. The rock is a grayish sandstone and the bottom is slighly concaved in contour. It almost looks like a fossilized something or perphaps an Indian tool or artifact, neither would be out of the question for this region. So what do you think ?