Article
Extended Data Fig. 1 | Overview of the site of Shum Laka. The left column
represents generalized stratigraphy, with radiocarbon dates (uncalibrated
years before present) shown as red dots on the y axis, and deposits indicated by
their archaeological nomenclature. P, S/Si, Pleistocene; T, A, Holocene; Ao,
Holocene ochre ashy layer; Ag, Holocene grey ashy layer (after ref.^76 ). Columns
1–6 display the chronological extents of technological traditions: 1, microlithic
quartz industry; 2, macrolithic f lake and blade industry on basalt; 3, bifaces of
the axe–hoe type; 4, pecked grounded adze and arrow heads; 5, pottery; and 6,
iron objects. Column 7 indicates the two burial phases. Column 8 shows
climatic reconstructions based on carbon stable isotopes and pollen from
organic matter extracted from sediment cores at Lake Barombi Mbo in western
Cameroon (more arid conditions to the left and more humid conditions to the
right^60 ,^76 ), along with archaeological eras. IA, Iron Age; LSA, Later Stone Age;
SMA, Stone to Metal Age. RMCA Collection; drawings by Y. Paquay,
composition © RMCA, Tervuren; modified by E. Cornelissen^77.