Its called the Meare Heath bow, and was made from Hickory. (in the UK anyway) The oldest bow EVER found was in Denmark and made from Elm. (circa 9000 years ago)
The Star Carr bow is considered older and made of willow - it was too light to hunt large game so may have been used for fish and/or wildfowl.
I thought the Somerset Meare Heath bow was Neolithic; relatively young!
Whatever the actual chronology, many woods were used long before yew

