The shores of Lake Turkana, where many fossils of human ancestors have been found, are also the home of what may be the oldest known tools.
Push the known date of such tools back by 700,000 years; they also may challenge the notion that our own most direct ancestors were the first to bang two rocks together to create a new technology.
Organic material like wood or bone rarely preserves in the archaeological record and the first stone tools would have looked very like lumps of broken rock (lacking the detailed patterns we see with later stone tools).
‘This new research is incredibly exciting as it pushed back the date for tool making by almost a million years which in turn means tools were being used even earlier than that.’
http://news.sciencemag.org/africa/2015/04/world-s-oldest-stone-tools-discovered-kenya