Figure 3

Geological map of the studied region. The three archaeological sites (Mbanza Kongo, Kindoki and Ngongo Mbata) are displayed on the map. The circle around the sites indicates a 7 km radius, which corresponds to an 84% probability of source exploitation². The map refers to DRC and Angola with the border line demonstrated on it. The geological map (shapefile in Supplement 11) was created in ArcGIS Pro 2.9.1 software (URL: https://www.arcgis.com/), with reference to Angolan⁴¹ and Congolese^42,65 geological maps (raster files), produced using different cartographic criteria.