Sample ID Analytical age* (14C yrs BP) Calibrated age (cal yr BP)§ Description of material submitted Weight (mg) Lat, Long (degrees) Accession number* δ13C
17IP-20-1A 1230±20 1250-1070 Detrital wood from lower terrace at Arbor terrace locality. 295 58.418324, -137.096412 OS-138521 -26.33
17IP-20-1B 1280±20 1280-1180 Detrital wood from lower terrace at Arbor terrace locality. (Replicate analysis of sample 17IP-20-1A). 295 58.418324, -137.096412 OS-138140 -26.07
17IP-20-1C** 1260±15 1270-1130 Combined result of replicate analyses of 17IP-20-1A and 17IP-20-1B. NA NA NA NA
17IP-16-4B 1,300±25 1290-1180 Conifer cone fragment from ponded sediment overlying lower terrace gravels, Kaknau Cliff section. 12 58.415083, -137.094194 OS-138142 -24.4
17IP-17-S1 1,560±35 1530-1370 Outer wood from 10-cm diameter stick or root protruding from gravel underlying the lower terrace, Kaknau Cliff section. Fluvial gravel. 393 58.415333, -137.09450 OS-138138 -24.4
17IP-15-S4 8,350±75 9530-9130 Outer wood from growth-position stump in gravel of outwash plain, Kaknau Cliff section. Stump rooted in outwash gravel. 1907 58.415170, -137.095927 OS-138137 -24.19
17IP-15-S3 8,390±40 9530-9300 Detrital organic litter from silt beds below outwash plain strath, Kaknau Cliff section. Equivalent to outwash gravel (comes from strata above sample 17IP-15-S1. 183 58.415170, -137.095927 OS-134718 -25.75
17IP-15-S1 8,650±40 9690-9540 Outer wood of growth position stump on strath underlying outwash plain, Kaknau Cliff section. Stump rooted in top of abandoned lake deposits. Covered by outwash gravel. Dates inception of outwash gravel deposition. 4509 58.415170, -137.095927 OS-134717 -25.74
17IP-14 8,660±80 9900-9490 Outer rings from large root or log protruding from gravel underlying the outwash plain, Kaknau Cliff section. Inferred to be rooted within outwash gravel deposit. 131 58.415626, -137.095160 OS-138139 -24.02
17IP-13-S5 8,780±40 10120-9560 Outer wood of 5-cm diameter root or horizontal stick deposited on strath underlying outwash plain, Kaknau Cliff section. Root or stick post dates laminated lake sediment b/c sample appears to be rooted in place growing into underlying strath, or detrital stick deposited on strath. Post dates lake sedimentation. 2536 58.415564, -137.095552 OS-134716 -25.14
17IP-18-10 9,320±45 10660-10310 Detrital stick on strath underlying lower fluvial terrace, Kaknau Cliff section. Stick is within deltaic sand unit, which is part of lake sediment sequence. 2374 58.415110, -137.093934 OS-134720 -24.94
17IP-18-7 9,510±45 11080-10590 Conifer cone parts (Sitka spruce cone?) from silt beds underlying lower fluvial terrace strath, Kaknau Cliff section. Cone detritus is within periglacial lake sediments. 163 58.415110, -137.093934 OS-134719 -23.54
*Analytical age calculated using a radiocarbon half-life of 5568 years and reported at one standard deviation in radiocarbon years before 1950 CE by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility, Woods Hole, Massachusetts. §Calibrated ages in years before 1950 CE rounded to nearest decade were calculated using OxCal (version 4.4.2, Bronk Ramsey [2009; 2023]; 95% probability distribution) with the IntCal20 dataset of Reimer et al. (2020). Latitude, decimal degrees north; longitude, decimal degrees west. #Bivalve shell date calibrated using Marine20 dataset (Heaton et al., 2020) with ΔR value of 311±48; a weighted mean of four nearest ΔR values within 180 km of Palma Bay (Reimer and Reimer, 2001; http://calib.org/marine/). **Combined results of duplicate analyses of a single sample ran by NOSAMS to assess impact of a combustion system problem detected in December 2017. Because the replicated results were in good agreement, NOSAMS recommended combining the results (Kathryn Elder, NOSAMS, pers. comm., February 2018). *Analytical age calculated using a radiocarbon half-life of 5568 years and reported at one standard deviation in radiocarbon years before 1950 CE by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility, Woods Hole, Massachusetts. §Calibrated ages in years before 1950 CE rounded to nearest decade were calculated using OxCal (version 4.4.2, Bronk Ramsey [2009; 2023]; 95% probability distribution) with the IntCal20 dataset of Reimer et al. (2020). Latitude, decimal degrees north; longitude, decimal degrees west. #Bivalve shell date calibrated using Marine20 dataset (Heaton et al., 2020) with ΔR value of 311±48; a weighted mean of four nearest ΔR values within 180 km of Palma Bay (Reimer and Reimer, 2001; http://calib.org/marine/). **Combined results of duplicate analyses of a single sample ran by NOSAMS to assess impact of a combustion system problem detected in December 2017. Because the replicated results were in good agreement, NOSAMS recommended combining the results (Kathryn Elder, NOSAMS, pers. comm., February 2018). *Analytical age calculated using a radiocarbon half-life of 5568 years and reported at one standard deviation in radiocarbon years before 1950 CE by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility, Woods Hole, Massachusetts. §Calibrated ages in years before 1950 CE rounded to nearest decade were calculated using OxCal (version 4.4.2, Bronk Ramsey [2009; 2023]; 95% probability distribution) with the IntCal20 dataset of Reimer et al. (2020). Latitude, decimal degrees north; longitude, decimal degrees west. #Bivalve shell date calibrated using Marine20 dataset (Heaton et al., 2020) with ΔR value of 311±48; a weighted mean of four nearest ΔR values within 180 km of Palma Bay (Reimer and Reimer, 2001; http://calib.org/marine/). **Combined results of duplicate analyses of a single sample ran by NOSAMS to assess impact of a combustion system problem detected in December 2017. Because the replicated results were in good agreement, NOSAMS recommended combining the results (Kathryn Elder, NOSAMS, pers. comm., February 2018). *Analytical age calculated using a radiocarbon half-life of 5568 years and reported at one standard deviation in radiocarbon years before 1950 CE by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility, Woods Hole, Massachusetts. §Calibrated ages in years before 1950 CE rounded to nearest decade were calculated using OxCal (version 4.4.2, Bronk Ramsey [2009; 2023]; 95% probability distribution) with the IntCal20 dataset of Reimer et al. (2020). Latitude, decimal degrees north; longitude, decimal degrees west. #Bivalve shell date calibrated using Marine20 dataset (Heaton et al., 2020) with ΔR value of 311±48; a weighted mean of four nearest ΔR values within 180 km of Palma Bay (Reimer and Reimer, 2001; http://calib.org/marine/). **Combined results of duplicate analyses of a single sample ran by NOSAMS to assess impact of a combustion system problem detected in December 2017. Because the replicated results were in good agreement, NOSAMS recommended combining the results (Kathryn Elder, NOSAMS, pers. comm., February 2018). *Analytical age calculated using a radiocarbon half-life of 5568 years and reported at one standard deviation in radiocarbon years before 1950 CE by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility, Woods Hole, Massachusetts. §Calibrated ages in years before 1950 CE rounded to nearest decade were calculated using OxCal (version 4.4.2, Bronk Ramsey [2009; 2023]; 95% probability distribution) with the IntCal20 dataset of Reimer et al. (2020). Latitude, decimal degrees north; longitude, decimal degrees west. #Bivalve shell date calibrated using Marine20 dataset (Heaton et al., 2020) with ΔR value of 311±48; a weighted mean of four nearest ΔR values within 180 km of Palma Bay (Reimer and Reimer, 2001; http://calib.org/marine/). **Combined results of duplicate analyses of a single sample ran by NOSAMS to assess impact of a combustion system problem detected in December 2017. Because the replicated results were in good agreement, NOSAMS recommended combining the results (Kathryn Elder, NOSAMS, pers. comm., February 2018). *Analytical age calculated using a radiocarbon half-life of 5568 years and reported at one standard deviation in radiocarbon years before 1950 CE by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility, Woods Hole, Massachusetts. §Calibrated ages in years before 1950 CE rounded to nearest decade were calculated using OxCal (version 4.4.2, Bronk Ramsey [2009; 2023]; 95% probability distribution) with the IntCal20 dataset of Reimer et al. (2020). Latitude, decimal degrees north; longitude, decimal degrees west. #Bivalve shell date calibrated using Marine20 dataset (Heaton et al., 2020) with ΔR value of 311±48; a weighted mean of four nearest ΔR values within 180 km of Palma Bay (Reimer and Reimer, 2001; http://calib.org/marine/). **Combined results of duplicate analyses of a single sample ran by NOSAMS to assess impact of a combustion system problem detected in December 2017. Because the replicated results were in good agreement, NOSAMS recommended combining the results (Kathryn Elder, NOSAMS, pers. comm., February 2018). *Analytical age calculated using a radiocarbon half-life of 5568 years and reported at one standard deviation in radiocarbon years before 1950 CE by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility, Woods Hole, Massachusetts. §Calibrated ages in years before 1950 CE rounded to nearest decade were calculated using OxCal (version 4.4.2, Bronk Ramsey [2009; 2023]; 95% probability distribution) with the IntCal20 dataset of Reimer et al. (2020). Latitude, decimal degrees north; longitude, decimal degrees west. #Bivalve shell date calibrated using Marine20 dataset (Heaton et al., 2020) with ΔR value of 311±48; a weighted mean of four nearest ΔR values within 180 km of Palma Bay (Reimer and Reimer, 2001; http://calib.org/marine/). **Combined results of duplicate analyses of a single sample ran by NOSAMS to assess impact of a combustion system problem detected in December 2017. Because the replicated results were in good agreement, NOSAMS recommended combining the results (Kathryn Elder, NOSAMS, pers. comm., February 2018). *Analytical age calculated using a radiocarbon half-life of 5568 years and reported at one standard deviation in radiocarbon years before 1950 CE by the National Ocean Sciences Accelerator Mass Spectrometry (NOSAMS) Facility, Woods Hole, Massachusetts. §Calibrated ages in years before 1950 CE rounded to nearest decade were calculated using OxCal (version 4.4.2, Bronk Ramsey [2009; 2023]; 95% probability distribution) with the IntCal20 dataset of Reimer et al. (2020). Latitude, decimal degrees north; longitude, decimal degrees west. #Bivalve shell date calibrated using Marine20 dataset (Heaton et al., 2020) with ΔR value of 311±48; a weighted mean of four nearest ΔR values within 180 km of Palma Bay (Reimer and Reimer, 2001; http://calib.org/marine/). **Combined results of duplicate analyses of a single sample ran by NOSAMS to assess impact of a combustion system problem detected in December 2017. Because the replicated results were in good agreement, NOSAMS recommended combining the results (Kathryn Elder, NOSAMS, pers. comm., February 2018).