They had been made of reeds lashed together with rope and coated with Bitumen. It has been in use for over six,500 years. We travel another 130kms south, and contact into the icon of the Barkly, Karlu Karlu known as the Satan's Marbles, which are ten minutes north of Wycliffe Nicely Vacation Park. https://Teamtie.org/classified/user/profile/138012