I was watching Ray Mears the other night, and he had a stone that totally reminded me of some somebody had posted up here. Mr Mears said 'ah yes - that might be Mesolithic but I use something almost exactly the same for shaping the wooden arrow shafts I make' or somesuch. But I can't find the right thread on here.
Basically it was someone saying they'd found stones with similar bite shapes out of them, and they'd taken them to a museum and been rebuffed.
But I thought whoever wrote it might be interested in getting the dvd and having a look (it was the last episode of his wild food series).