Discovered at the site of Kalambo Falls, Zambia, it is currently the oldest known wooden structure,[1] determined through luminescence dating to be at least 476,000 years old[1] and predating Homo sapiens.

Geoff Duller, who was part of the team that made the discovery in 2019, said high water levels and fine sediment encasing the structure helped to preserve the wood.

[1][4] The structure consists of two interlocking wooden logs of large-fruited bushwillow (Combretum zeyheri), connected by a notch securing one perpendicular to the other.

Another wooden log, showing tapered ends and a similar notch, had previously been described in Site B of Kalambo Falls, also from the Acheulean, although not conclusively identified as part of a hominid-made structure at the time.

As no hominin remains have been discovered at Kalambo Falls, no conclusive attribution has been made, although a 300,000-year-old Homo heidelbergensis skull has been found at another Zambian site.