Scope out these strange notches!

Found on the Susquehanna in Maryland. Been sifting through a spot with lots of quartzite and rhyolite debitage, and I have found several broken/unfinished points (including my first proper spear, or at least *half* of one.) but this is the only other whole point that’s turned up.

Anyways, I could not find any examples of points with a similar topology. How would this have been hafted onto a shaft, I wonder?