Table 1.
Accelerator mass spectrometer radiocarbon dates from block excavation Unit X contexts at the Riverton site
| Feature | Age, AMS-calibrated calendar years B.P. |
Age, radiocarbon years B.P. | Laboratory sample no. | Material dated | |
|---|---|---|---|---|---|
| Intercept | 1σ age range | ||||
| 29 | 3,620 | 3,680–3,660 | |||
| 3,640–3,570 | 3,370 ± 40 | β253115 | Hickory hull | ||
| 8A | 3,690 | 3,810–3,800 | |||
| 3,720–3,640 | 3,440 ± 40 | β253117 | Walnut hull | ||
| 13A | 3,810 | ||||
| 3,800 | |||||
| 3,720 | 3,830–3,690 | 3,480 ± 40 | β253116 | Walnut hull | |
| 1B | 3,820 | ||||
| 3,800 | |||||
| 3,730 | 3,830–3,700 | 3,490 ± 40 | β253114 | Walnut hull | |
Calendar calibrations are based on the Pretoria Calibration Procedure and the Intcal 98 Calibration database.