Table 1.

Accelerator mass spectrometer radiocarbon dates from block excavation Unit X contexts at the Riverton site

FeatureAge, AMS-calibrated calendar years B.P.
Age, radiocarbon years B.P.Laboratory sample no.Material dated
Intercept1σ age range
293,6203,680–3,660
3,640–3,5703,370 ± 40β253115Hickory hull
8A3,6903,810–3,800
3,720–3,6403,440 ± 40β253117Walnut hull
13A3,810
3,800
3,7203,830–3,6903,480 ± 40β253116Walnut hull
1B3,820
3,800
3,7303,830–3,7003,490 ± 40β253114Walnut hull
  • Calendar calibrations are based on the Pretoria Calibration Procedure and the Intcal 98 Calibration database.