Finds like this are always good for news but I'm a skeptic. If they are claiming that these were knapped, I would like to see close-up view of the flake scars that show reverse hinges, multiple step fractures/islands/turtle backs, and beveled edges... all human flintknapping signs that nature has a hard time imitating. If they are natural stones that were picked up and used for tools, well, that's a different story.