Fig. 4: Wall sections of three main stratigraphic units.
From: Early Oldowan technology thrived during Pliocene environmental change in the Turkana Basin, Kenya
The three archeological horizons (NMT3 dated to 2.44 Ma; NMT2 attributed to 2.60 Ma; and NMT1 attributed to 2.75 Ma). These archeological horizons are correlated to the composite stratigraphy for the Area 40 region. Wall sections depict the distribution of artifacts in these stratigraphic units. The right diagrams reflect the proportion of artifacts in major typological categories102 and the major rock types present in these archeological assemblages (see Supplementary Data 3). A high prevalence of chalcedony is evident in all the archeological horizons. Yellow circles represent individual stone artifacts greater than 2 cm, white-blue stars represent faunal specimens recovered in situ during excavations (see Supplementary Fig. 6), and the red diamond represents the cut-mark bone described in Supplementary Fig. 8. Note that fauna was poorly preserved in the older and younger time horizons.
