Pre-Chellean
The Pre-Chellean Culture existed between 125,000 BCE to 100,000 BCE. Through this period, the tools developed by early humans were mostly flints and stones used as nature provided them. The coup-de-poing or "blow-of-the-fist" stone—a rocksharp at one end and round at the other, to fit the palm of a hand—became for this primeval human hammer, Axe, chisel, scraper, knife, and saw; even to this day the word hammer means etymologically stone.
Source: Durant, Will, The Story of Civilization, Vol. 1: Our Oriental Heritage, A history of civilization in Egypt and the Near East to the Death of Alexander, and in India, China, and Japan from the beginning. New York: Simon & Schuster, 1954.
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Full disclosure, I may occasionally borrow a sentence from Will Durant's Story of Civilization. I absolutely love that collection!