In 2023, archaeologists announced the discovery of wooden structures and other wooden artifacts, which were determined to be at least 476,000 years old using luminescence dating. The discovery predates Homo sapiens, so the tools may have potentially been made by Homo heidelbergensis, of which a 300,000 year old skull was found at another Zambian site. The discovery was considered unusual because wood does not usually survive for so long. Archaeologists such as Larry Barham of the University of Liverpool, one of the discoverers of the wooden structures, believes that wooden tools were potentially even more common than stone tools in the Stone Age, but due to wood decaying quickly in the ground archaeologists could not find such tools.