Comment by sam_goody

Do we know if these were formed intentionally or just happened to be in such a form and were used by those that found them?

Do we know if these were used more than once, or if they were in a convenient shape that was grabbed by a local for one time use?

How do we know that these were actually used as tools and not just pieces of wood that coincidentally in the site?

Do we have any reason to think these were used by (precursor to) humans more than ravens, beavers or any other number of animals that use tools?

Because of the paywall I could not read the whole article, but the pictures and intro leave a lot unanswered.