Figure 1

Garba IV site. (a) Location map of Melka Kunture and the Garba IV site (modified after https://upload.wikimedia.org/wikipedia/commons/2/24/Africa_satellite.jpg, https://commons.wikimedia.org/wiki/File:Awashrivermap.png, and https://data.humdata.org/dataset/ethiopia-elevation-model using QGIS software; https://qgis.org); (b) Plan of archaeological level E with position of GAR IVE (modified after Fig. 4A from Ref.27); (c) Stratigraphic log of Garba IV (Photoshop CS3; https://www.adobe-photoshop); (d) schematic cross-section of the archaeological levels (modified after Fig. 3B from Ref.27). The map of the Awash River (https://commons.wikimedia.org/wiki/File:Awashrivermap.png) is licensed under the Creative Commons Attribution-ShareAlike 3.0 license. The license terms can be found on the following link: http://creativecommons.org/licenses/by-sa/3.0/.