Extended Data Fig. 1: Geological and stratigraphic context of the Calio site.

a, Digital Elevation Map of the southwestern peninsula of Sulawesi and b, Simplified geological map of the same area. Small red square indicates area shown in c, geological map of the study area. 1: Modern alluvium; 2: Late Pleistocene alluvial terrace; 3-7: Lithological sub-units of the Walanae Formation (3: Beru Member Sub-Unit B [fluvial facies]; 4: Beru Member Sub-Unit A [fluvio-estuarine facies]; 5: Samaoling Member [shallow marine facies]; 6: Burecing Member [deep marine facies]; 7: Tacipi Limestone Member); 8: strike and dip; 9: horizontal bedding; 10: inferred fault; 11: sites with surface collected stone artefacts; 12: sites with in situ stone artefacts; 13: vertebrate fossil localities. Rectangle indicates the area surrounding Calio shown in d, contour map of the Calio excavation area showing the palaeomagnetic sampling sites (red circles). The stratigraphic section shown in Extended Data Fig. 5 was measured along the main road. Green dashed lines connect the sampling sites with the measured section, taking into account topography and strike and dip. Panels a-c modified after ref. ¹⁴.