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. 2014 Jul 14;111(30):10972–10977. doi: 10.1073/pnas.1404546111

Fig. 2.

Fig. 2.

Schematic geologic cross-section through locality 1 (the main excavation area) south through the locality 3 island and then southwest to the uplands (Fig. 1) where diagnostic Clovis and later period archaeological materials were found on the surface of an eroded soil named “Big Red” owing to its striking color. In other localities, the Big Red soil is buried and is equivalent to upper stratum 2. Dates are means in radiocarbon years (rcy).