Fig. 2: Stratigraphy, artefact density, geochronology, sedimentology and biomarkers from the Bété I sequence.
From: Humans in Africa’s wet tropical forests 150 thousand years ago

Artefact densities are derived from ref. 21. Numerical age uncertainties are given at 1σ. NC and ND are the total numbers of lithics artefacts found in Units C and D, respectively.