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Reconstructing hammerstone size flake by flake: an experimental approach.

Li Li1,2, Shannon P McPherron1,2

  • 1The Interdisciplinary Center for Archaeology and the Evolution of Human Behaviour, University of Algarve, Faro, Portugal.

Journal of the Royal Society, Interface
|May 13, 2025
PubMed
Summary
This summary is machine-generated.

Researchers found that flake ring crack size can estimate hammerstone size in stone tool production. This helps reconstruct hominin behavior and technological advancements by understanding force application during knapping.

Keywords:
Hertzian conefracture mechanicshammerstonering crackstone tool production

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Area of Science:

  • Lithic technology analysis
  • Paleolithic archaeology
  • Experimental archaeology
  • Fracture mechanics

Background:

  • Reconstructing hominin behavior, technological advancements, and biomechanics relies on understanding force application in stone tool production.
  • While stone tool production is extensively studied, linking specific knapping outcomes to hammerstone use remains challenging due to complex fracture mechanics and material signatures.
  • Key variables influencing flaking outcomes and hammerstone use are poorly understood.

Purpose of the Study:

  • To explore factors driving flake ring crack size using fracture mechanics.
  • To systematically examine how hammerstone size, velocity, and strike angle influence ring crack and flake size under controlled conditions.
  • To establish a method for estimating hammerstone size from flake characteristics.

Main Methods:

  • Conducted controlled experiments to analyze flake ring crack size, a feature of conchoidal flaking.
  • Systematically varied hammerstone size, velocity, and strike angle to assess their impact on fracture mechanics.
  • Validated experimental findings with previously reported controlled and replicative experiments.

Main Results:

  • Demonstrated a direct relationship between hammerstone use variables (size, velocity, angle) and flake ring crack size.
  • Established that flake ring crack size can be used to estimate hammerstone size.
  • Provided quantitative data linking specific force application parameters to lithic artifact features.

Conclusions:

  • Flake ring crack size serves as a reliable indicator of hammerstone size used in lithic production.
  • This finding enables a more detailed reconstruction of the force application variability during the stone knapping process.
  • Advances the understanding of hominin technological behavior and biomechanics through improved analysis of lithic artifacts.