Early humans revealed to have engineered optimized stone tools at Olduvai Gorge
Early Stone Age populations living between 1.8 – 1.2 million years ago engineered their stone tools in complex ways to make optimised cutting tools, according to a new study by University of Kent and UCL.
The research, published in the Journal of Royal Society Interface, shows that Palaeolithic hominins selected different raw materials for different stone tools based on how sharp, durable and efficient those materials were. They made these decisions in conjunction with information about the length of time the tools would be used for and the force with which they could be applied. This reveals previously unseen complexity in the design and production of stone tools during this period.
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Their research, which employed experimental methods more commonly used in modern engineering research, shows that hominins preferentially selected quartzite, the sharpest but least durable stone type at Olduvai for flake tools; a technology thought to have been used for expedient, short-lived cutting activities.
Chert, which was identified as being highly durable and nearly as sharp as quartzite, was only available to hominins for a short 200,000 year period. Whenever it was available, chert was favoured for a variety of stone tool types due to its ability to maximise cutting performance over extended tool-use durations. Other stone types, including highly durable lavas, were available at Olduvai, however their use varied according to factors such as how long a tool was intended to be used for, a tools potential to create high cutting forces, and the distance hominins had to travel to raw material sources.
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https://www.heritagedaily.com/2020/01/early-humans-revealed-to-have-engineered-optimized-stone-tools-at-olduvai-gorge/125318