This improved technology created more durable tools that maintained their sharpness longer than earlier types of tools.Microscopic examination has shown their tools were mainly used on meat, bone, animal hides and wood.Homo ergaster was the first human species to take advantage of these more arid and open environments.

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The slopes near the northwest shore of the lake contain an extensive sedimentary record that can be matched with others in the nearby area, including some that have been dated using radioactive decay.

A few meters below the sediments that contained the tools lies a feature that has been dated to 1.9 million years ago; above them, a different feature sets a younger limit at 1.5 million years.

These tools were suitable for heavy duty work including processing bones for marrow, butchering large mammals and woodworking.

This new technology was developed by continued to use this technology in Africa and they also took this technology with them when they spread into Eurasia.

Mode 2 technology includes straight-edged cleavers, pointed picks and hand axes.

These tools are often called Acheulean stone tools after St Acheul in France where similar tools were first discovered during the 1800s.

But, starting with the australopithecines, our ancestors started making permanent tools from rocks, and investing increased effort into shaping.

Oldowan tools were later used by the first members of the genus was using the far more involved and sophisticated Acheulian tool technology, which later made its way out of Africa.

But the transition between the two tool types has remained unclear.

Now, scientists are reporting the first find where Oldowan and Acheulian tools have been found at the same site, one that's old enough to indicate that Acheulian tools were available when skeleton, which dates from 1.5 million years ago.

These tough vegetables may have been processed using their improved technology as their smaller molar teeth imply that they ate foods that required less chewing.