Thanks Y'all. I think the bowl thing was made naturally it was the stone that encased a flint nodule, that left the bowl shape. The natives either broke it open or found it broke open and formed it, the back is also concave. I think they used it to mix or grind in (tattoo ink, dart poison, war paint ) you name it. Little rock bowls that are complete are pretty scarce around here. Most are broken. It is the second whole one I've seen come out of this area. A lot of tools at this site. Someone has done a pretty good job at collecting up the points and even broke points are hard to find in this area. I'll just have to look harder.