This grinding stone is from the Northern Tablelands of New South Wales.  The artefact was returned to the Anaiwan People by a collector, and it was returned back to country after the 3D model was made.

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This grinding stone is made from a very hard sandstone or quartzite.  The periphery was shaped by unifacial percussion flaking followed by flaking and grinding.  Both faces show signs of use as a grinding stone.  Given the flat profile and relatively large size, is was probably used as a bottom stone, rather than a top stone, in processing seeds or other plant foods.