Extended Data Fig. 4: Analysis of sediment from the stratigraphic sequence and the burial pit.

a, Particle size ternary diagram indicating the higher content of sand and silt in the burial pit in comparison to the encasing archaeological layers, and in particular layer 19. b, Examples of particle size distribution and multimodal decomposition showing the similarities of sand and silt modes between the burial samples and samples 137 (base of layer 17) and 138 (top of layer 18). c, Elemental profiles of sediment from layers 17, 18, 19 and the burial pit. Element concentrations are expressed in percentages. Data are presented as mean values. Sediment samples from the burial pit display an elemental composition notably similar to the three samples identified as an anomaly at the top of layer 18 and the base of layer 17. d, Results of PCA of the centre log ratio data (selected elements: SiO₂, K₂O, TiO₂, MnO, Fe₂O₃, Zn, Ga, As, Rb, Y, Zr and Ba). Confidence ellipses at 95%. The burial pit samples markedly differ from layer 19.