Radiometric dating is based on the idea that

Later forms of early humans also used Acheulean techniques and are described below.There is considerable time overlap in early prehistoric stone-working industries.More than a million years ago Acheulean tool users left Africa to colonize Eurasia.Their oval and pear-shaped hand axes have been found over a wide area. Although it developed in Africa, the industry is named after the type site of Saint-Acheul, now a suburb of Amiens in northern France where some of the first examples were found in the 19th century.They lived by gathering plants and hunting wild animals.The Oldowan is the archaeological term used to refer to the stone tool industry that was used by hominids during the earliest Palaeolithic period.For a long time it was thought that the Oldowan was the earliest stone tool industry in prehistory, from 2.6 million years ago up until 1.7 million years ago.

The Palaeolithic age began when hominids (early humans) started to use stones as tools for bashing, cutting and scraping.It reached its peak with early species of Homo such as H. Acheulean is the industry of stone tool manufacture by early humans of the Lower Palaeolithic era in Africa and much of West Asia and Europe.Acheulean tools are typically found with Homo erectus remains.They are first developed out of the more primitive Oldowan technology some 1.8 million years ago, by Homo habilis.It was the dominant technology for most of human history.They were made by all previous members of the genus, starting with relatively crude tools made by Homo habilis and Homo erectus.In Europe, the large-brained Neanderthal Man (Homo neanderthalensis) made tools of high quality, and was in turn outshone by the many tools made by our own species.In individual regions, this dating can be considerably refined; in Europe for example, Acheulean methods did not reach the continent until around 400 thousand years ago and in smaller study areas, the date ranges can be much shorter.Numerical dates can be misleading however, and it is common to associate examples of this early human tool industry with one or more glacial or interglacial periods or with a particular early species of human.Now it is realised that stone tools were used much earlier (3.3 million years ago) and that was definitely before the genus Homo had evolved.It is not known for sure which species actually created and used Oldowan tools. Early Homo erectus appears to inherit Oldowan technology and refines it into the Acheulean industry beginning 1.7 million years ago.

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