Table 1 Radiocarbon dates for Late Pleistocene and Early Holocene layers at sites.

All dates were calibrated using shcal04 (44), unless otherwise noted. Bracketed values indicate that the calibrated range impinges upon the end of calibration data set.

Sample no.Provenienceδ13CConventional
radiocarbon
1σ (68%) calibrated
age range (B.P.)
2σ (95.4%) calibrated
age range (B.P.)
Material
Unit 9
  Beta437295Premound occupation, Layer 12−28.212,610 ± 4014,771–15,07014,520–15,155*Wood charcoal
Unit 12
  Beta235952Premound occupation, Layer 11−25.29,580 ± 4010,698–11,08910,600–11,159*Charred rush stem
(Juncus sp.)
  Beta437290Premound occupation, Layer 20−29.712,410 ± 4014,154–14,78514,109–14,961Wood charcoal
  Beta437288Premound occupation, Layer 23−29.212,420 ± 4014,166–14,80914,119–14,972Wood charcoal
  D-AMS 016635Premound occupation, Layer 23−13.312,602 ± 3514,590–15,137*14,317–15,182*Wood charcoal
Unit 15/21
  Beta290621Premound occupation,
Stratum 9
−25.611,500 ± 5013,294–13,40113,260–13,420Charred wood
  Beta299536Premound occupation,
Stratum 13
−28.011,800 ± 5013,757–13,517**13,794–13,459*Wood charcoal
  Beta310272Premound occupation
top of Layer 13a
−22.812,280 ± 6014,005–14,47713,924–14,867Deer bone
  Beta310273Premound occupation
bottom of Layer 13a
−29.012,240 ± 5013,991–14,18413,891–14,530Wood charcoal
Unit 16
  AA86632Layer 14-6§−14.29,230 ± 4010,379–10,18310,486–10,158Avocado seed (Persea sp.)
  D-AMS 013332Layer 16−23.812,594 ± 6214,386–15,143*14,221–15,217*Bean seed (Phaseolus sp.)
Unit 22 (Paredones)
  Beta343109Premound, Sangamon
Terrace, Level 7
−19.29,330 ± 4010,308–10,55910,285–10,578Chile pepper seed
(Capsicum spp.)
Test Pit 22
  Beta210862Premound occupation,
Layer 20 (4a)
−27.49,530 ± 5010,594–10,78510,579–[11,000]Wood charcoal
  AA75326Premound occupation,
Layer 22 (8a)
−26.810,770 ± 34012,164–13,09611,508–13,344Wood charcoal
  Beta310274Premound occupation,
Layer 25 (8b)
−21.712,950 ± 5013,554–13,82813,301–14,034Sea lion bone
  Beta290620Premound occupation,
Layer 28 (11a)
−28.311,780 ± 5013,510–13,732‡13,440–13,720Wood charcoal

*Calibration done on curve (shcal13) other than shcal04.

†Calibrated using marine 09.14c calibration curve with delta uncertainty of 725 ± 173 (35).

‡Calibrated using Intcal09 calibration curve.

§Layer 14-6 refers to a layer with several distinct lenses numbered 1 to 7.