Tool

I saw this lying in short grass -  on soil - in a park south of Adelaide. It can be grasped comfortably between my thumb and first finger and a sharp edge has a bevel. No more and no less than seems perfect for say schucking oysters. Not that I have. You know what I mean.

Credit to CanCarrier whose :) neolithic cutting axe reminded me of my treasure.
https://www.blipfoto.com/entry/2016980823604986399