I must say on a purley factual level some stone age tools were of sedimentry rocks, I guess people on occasion used whatever was to hand.I agree the were not the tool or weapon of choice of course though.
But having seen many thousands of admitadly mostly mesolithic tools dug & itemsed, as well as having owned & studied the personal collection of an archaelogist that was aquired & dug from m 3 continents mostly between the world wars, I tottaly agree with evryone else this is a possibly frost & or certanly mechanichly damaged & water rolled stone, shaped by the forces of nature.
Many Victorian archaelogists fell for their charms as well, there often called Eoliths.
Some still believe in them. Ive even wanted to myself
on one occasion.
spiral