Archaeology Term: bulb of Percussion
A bulb of percussion is a distinctive feature found on the surface of a flake, formed as a result of the force applied during the process of flintknapping.
This small, rounded protrusion provides valuable clues about the technique used to create the flake and the skill of the toolmaker.
When a flintknapper strikes a core with a hammerstone or another tool, a fracture propagates through the stone, resulting in the detachment of a flake. The point of impact, where the force is initially applied, is often marked by a bulb of percussion. The size, shape, and location of the bulb can vary depending on the type of stone, the angle of impact, and the force applied.
The presence or absence of a bulb of percussion is a key criterion used by archaeologists to distinguish between naturally fractured stones and those that have been intentionally shaped by humans. A well-defined bulb of percussion is a strong indicator of human intervention and can be used to identify tools and debris produced by early humans.
By analyzing the characteristics of bulbs of percussion, archaeologists can gain insights into the cognitive abilities and technological skills of ancient toolmakers. The presence of specific types of bulbs can be linked to different lithic reduction techniques, such as direct percussion, indirect percussion, and pressure flaking.
The study of bulbs of percussion is essential for understanding the early stages of human technological development and the emergence of complex toolmaking traditions.
By examining these small but significant features, archaeologists can piece together the puzzle of human history and gain a deeper appreciation for the ingenuity of our ancestors.
