Table 1.
Direct AMS radiocarbon age determinations for the earliest occurrence of indigenous domesticated seed crops in eastern North America
| Domesticated plant species | Age, AMS-calibrated calendar years B.P. |
Age, radiocarbon years B.P. | Laboratory sample no. | Archaeological site and provenience | |
|---|---|---|---|---|---|
| Intercept | 1σ age range | ||||
| Pepo squash (C. pepo ssp. ovifera) | 5,025 | 5,290–4,870 | 4,440 ± 75 | ß 47293 | Phillips Spring (Unit K2) |
| Sunflower (H. annuus) | 4,840 | 4,860–4,830 | 4,265 ± 60 | ß 45050 | Hayes (Level 14) |
| Marshelder (I. annua) | 4,400 | 4,420–4,290 | 3,920 ± 40 | ß 216463 | Napoleon Hollow (Feature 20) |
| Chenopod (Ch. berlandieri) | 3,700 | 3,900–3,490 | 3,450 ± 150 | ß 11348 | Cloudsplitter (F.S. 1361 |
| 3,640 | 3,840–3,460 | 3,400 ± 150 | ß 11347 | Newt Kash (El 1114) | |
Calendar calibrations are based on the Pretoria Calibration Procedure and the Intcal 98 Calibration database.