How many artifacts were found? In just a few meter-square sample pits over a several acres, archaeologists collected 10s of thousands of stone tools and products of tool making. The archaeologists estimated that there are on average 900 artifacts per 100x100x10 cm volume of material in this area with much of the area up to 2 meters deep in artifact rich soils. This high concentration of artifacts along with available source rock in outcrops nearby suggests that long ago this [Kathu, South Africa] was a tool making center.
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Related reading: Africa is Archaeologically Rich; Sudan is Archaeologically Rich; A Scientific Timeline of Genesis; 500,000 Year Engraved Shell