The rarity of wood preservation at early archaeological sites - it is perishable over time - means scientists have little understanding of how early humans used it.
"Wood can be shaped into a variety of forms making it an excellent construction material that is strong and durable," Barham added.
The Kalambo Falls logs were determined to be from about 476,000 years ago.
Wooden tools for foraging and hunting are known from about 400,000 years ago.
"Use of wood in this way suggests the cognitive ability to these early humans was greater than we have believed based on stone tools alone."
Persons:
Larry Barham, Barham, Geoff, heidelbergensis, Will Dunham, Daniel Wallis
Organizations:
University of Liverpool, REUTERS, Aberystwyth University, Thomson
Locations:
Zambia, Handout, Africa's, England, Wales, Morocco, Kalambo, Clay, Israel, Washington