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They are found in Europe somewhat later, from about 1 mya (0.7mya for Britain).
The Palaeolithic is by far the longest period of humanity's time, about 99% of human history.
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.
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.
Then, later, Acheulean tools occur at the same time as the more sophisticated Mousterian.
The Acheulean was not a neatly defined period, but a tool-making technique which flourished especially well in early prehistory.
Acheulean was a basic method for making stone tools which was shared across much of the Old World.
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.
These tools are the first cultural products which have survived.