What are Acheulean hand axes and cleavers?

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Side-view illustration of a Homo erectus individual, depicted with a robust, upright body covered in hair, walking with one arm bent. A scale bar beside the figure shows measurements in inches and centimeters. — Homo erectus Artist's rendering of *Homo erectus*, which lived from approximately 1,700,000 to 200,000 years ago.

Acheulean hand axes and cleavers are the most characteristic tools of the Acheulean industry, the first standardized toolmaking tradition associated with Homo erectus and early Homo sapiens.1

Hand Axes: These were bifacial implements created by removing flakes from both sides of a stone core. Over time, manufacturing techniques evolved from using "anvil" stones to hammerstones, and eventually to bone or wood "hammers." This progression allowed for the creation of smoother, sharper tools with straighter edges compared to the crude, sinuous-edged pointed bifaces of the early Acheulean period.1
Cleavers: These were large tools distinct from hand axes, characterized by having one end squared off to create an axlike cutting edge.1

These tools were typically crafted from stone with good fracture characteristics, such as flint, jasper, or chalcedony. They represent a significant technological advancement during the early Paleolithic Period, reflecting the adaptive capabilities of early humans across diverse environments.1