It seems what I've found may represent two or three time periods, due to general style. I hope I still have my box full of stones which look like the continent of Africa; as "Africa" stones are po****r online. I never sold a stone. I am interested in missing links & collection galleries. I said, as a child, I wanted to be an archeologist. Well, if these large~game tools are man~made, then, they are amazing. I will get some photos made, to post. These are mostly sandstone & two shades of chert. I may have found preforms, cores, spear~heads, grinders, blades, spheres...