Picked this up because it is so obviously a percussive flake:
You see a "bulb of percussion", and little radiating lines. Also the curved lines perpendicular to the radiating ones are typical conchoidal fracture. I think this is called "errailure".
A bit of the original outer surface, looks a but polished.
The "working edge" shows little scallops.
Also this is a cautionary example. I am out at the opening of the harbor, looking for archaeology other than those stone rings (see here). It is underfoot, hiding within un-expected tool shapes.
I’d imagine there were countless expedient tools manufactured for every point. Therefore artifacts like that are probably laying around all over the place, but most don’t have the experience and powers of observation to discern them or care about artifacts with no monetary value. My ego gets a boost from finding things that others wouldn’t pick up on.
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