Dimpled GrindstoneCollection Highlights | Updated 7 years ago Dimpled Grindstone Photo by Alice Beale South west grindstones are typically small and have dimples on the flat surfaces. They are interpreted as multi-purpose tools used as an anvil in stone tool knapping, for cracking hard seeds such as Santalum spp. and for grinding the tips of wooden artefacts. Donated by M. Turkovich, from deceased estate. Archaeology collection View the discussion thread.