In the Parking lot of konso-Gardola in southern Ethiopia found the hand ax Acheulean culture age of 1.4 million years, made from the upper part of the left femur of a Hippo, reported in the Proceedings of the National Academy of Sciences. Chops, judging by the location of the traces of wear on it, used to cutting or sawing the various items. Such guns were usually made of stone and bone treatment considered more complex. It turns out that ancient people in East Africa for quite some time created a very advanced guns.
The Acheulian technology of machining for the guns originated about 1.76 million years ago, and the new tools made on it, found in the layers of the age 150-120 thousand years. Items of Acheulian culture were more difficult than those made in the Oldowan technology, and differed from the more ancient in the first place so that the stock material are treated the same on both sides, not just split large stones as”hammers”. It turned out symmetrical axes, which can be used as hand hatchets, and knives, and in other ways. The first 500 thousand years (and in some places longer) Acheulian tools are actually not changed and only then become more complicated: they are there traces of primary rough and secondary more subtle processing.