Figure 8

Paleo Unit 25 (PU25) profile at site 8WA329 showing platinum (Pt) abundance in ppb (error = ± 0.1 ppb) (Supplementary Table 7), OSL age estimates (Table 1), from PU23 (for stratigraphic comparison), microspherule abundances (spherules/kg) (Supplementary Table 10), and stratigraphic position of an in-situ Early Paleoamerican Simpson Point.