A local worker initially noticed stone tools and animal fossils eroding from ... cruder implements like those found at Lomekwi 3, a 3.3-million-year-old site in northern Kenya.

The discovery of cut-marked bones in Dikika, Ethiopia (in 2009) dated at 3.4 million years, and in 2011 of stone tools at Lomekwi, Kenya from 3.3 million years ago, changed scientists’ ideas of ...