Neanderthal biface handaxe "a gibbosite". Flint, height 4 3/8". Fine axe, excellent condition. "A gibbosite" refers to a biface axe with a protuberance or extension along one edge, probably used as a crushing tool or hammer. If you look at the photo, you can see this on the left side of the left-hand photo as a slight extension that terminates as a flat edge. In the case of this particular tool, that extension may have originally been cut off flat, or may have been very early use damage, as the patina matches that of the overall piece. Beautiful, essential axe. Grand-Pressigny region, turned up by an agricultural tiller. Approximate dates 80,000-50,000 BCE.