This study examines the technological transition from Oldowan to Acheulean stone tool industries in the archaeological record of East Africa, with particular focus on sites in the Cradle of Humankind region. Through comparative analysis of lithic assemblages from Olduvai Gorge, Koobi Fora, and recent discoveries at Atapuerca, we trace the cognitive and biomechanical developments that enabled increasingly sophisticated tool production over a span of approximately 1.5 million years.

The evidence suggests that the emergence of bifacial handaxe technology represents not merely an improvement in raw material reduction strategies, but a fundamental shift in hominin spatial cognition and planning depth. We propose that the Acheulean transition can be understood as an example of cumulative cultural evolution operating on timescales visible in the archaeological record.