Finding the splintered rocks that showed evidence of being used as tools was one thing ... The site is too old for carbon dating, and the ancient volcanic ash that has preserved the artifacts ...

A revolutionary three-million-year-old stone tool discovery in Kenya's ... Part of what is called an Oldowan tool kit, the tools were made by early hominins who learned to knock pieces of stone ...

Finding the splintered rocks that showed evidence of being used as tools was one thing ... The site is too old for carbon dating, and the ancient volcanic ash that has preserved the artifacts ...