No. 78: Nov-Dec 1991
Between 240,000 and 750,000 years ago, someone in the northern Jordan Valley made a flat, polished plank, 25 centimeters long, from a willow tree. The area where the plank was found is Middle Pleistocene in age and rich in stone tools as well as fragments of wood.
("Mollusc Confirms Dating of Oldest Known Plank," New Scientist, p. 14, July 20, 1991.)