Ancient Throwing Stone or Tool? greyhound plate These will be packed SUPER

These will be packed SUPER carefully for safe travel

in the South of France

A little wear to the fabric on the bottom corner of the spine

13 1/4" x 9 3/8" x 3 1/8"

and then (I think) feet of sorts carved at bottom

Ancient Throwing Stone or Tool? greyhound plate These will be packed SUPERI purchased this from a wonderful dealer in New Hampshire whose cabinet of curiosities includes objects decommissioned from museums and science departments as well as gathered from estate collections all over. She didn't know the origins of this stone and neither do I, but it sure looks like a throwing stone to me! If not certainly used as a tool of some sort, with a couple of divets on the bottom one just the right shape for a thumb gripping it.