I suppose...

So far I had picked up what as on the surface and just a little under. Two months ago, I dug deeper, 8 to 10" down. To my amazement, I thought I had found, I suppose, a treasure trove of stone tools. Each rock felt in my hands like it had a purpose. The experience felt like as if I had been  locked in the storage room of an orchestra. I had looked at the instruments over and over for a long period of time and knew they were instruments without knowing what purpose they had nor what they could do.
I designed categories of shapes I saw over and over. Nothing scientific by any means. Just observation.
1. Triangles

2. Triangles with a flat base

3 Diamond shaped