TIL that the "perfect" stone tool I found was actually a modern road grader chip

I was on a dig near Austin last spring and pulled this flint piece that looked exactly like a Paleo-Indian knife, got super excited showing the team lead. Turned out it had fresh conchoidal fractures from a heavy machine blade hitting a rock, not human knapping at all. Anyone else ever get tricked by a fake artifact that looked way too good to be real?

3 comments

3 Comments

troyc1714d ago

Man I gotta say, that conchoidal fracture thing is actually a really common mixup. A lot of people don't realize that road graders and heavy equipment can leave pretty convincing flake scars, especially on chert or flint. But here's the thing though, a true human-knapped piece usually has a clear bulb of percussion and a distinct platform where the flake was struck off. A machine chip tends to have a more scattered, less organized break pattern. I bet if you looked at it under a loupe you'd see microscopic striations that are totally different from a hammerstone or antler punch.

ben_fisher14d agoMost Upvoted

Funny you mention the microscope thing. I still remember this one time back in the early 2000s, I was helping a friend sort through a box of old stone tools at a local historical society. There was this one piece that had everyone scratching their heads, looked like a perfect arrowhead but felt too rough. We took it to a guy who had a good hand lens, and he pointed out these tiny little grinding marks on the edge, something about how the machine had dragged the stone against a metal surface. That changed how I look at just about any flaked stone now. You really start to notice the difference once you see it up close a few times, especially the way the bulb of percussion sits different from a true human strike.

lucashenderson7d ago

A loupe tells the real story every time.