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Earliest Human Presence in North America Dated to the Last Glacial Maximum: New Radiocarbon Dates from Bluefish Caves, Canada

Fig 3

New radiocarbon determinations obtained on bone from Bluefish Caves I and II.

The red dot on the map indicates the location of the site. Conventional radiocarbon ages are expressed in 14C BP [70], values are ± one standard error [71]. Calibrations (cal BP) were made using OxCal 4.2 [67] and the INTCAL113 calibration curve [68]. ‘Used’ represents the amount of bone powder pretreated in milligrams. ‘Yield’ represents the weight of collagen or ultrafiltered collagen in milligrams. ‘%Yield’ is the percent yield of extracted collagen as a function of the starting weight of the bone analyzed. ‘%C’ is the carbon present in the combusted collagen and averages 40 ± 2% in the ORAU. Stable isotope ratios are expressed in ‰ relative to vPDB [72] with a mass spectrometric precision of ± 0.2 ‰ for C and ± 0.3 ‰ for N. ‘CN’ is the atomic ratio of C to N and is acceptable if it ranges between 2.9–3.5. aDenote duplicate measurements from the start of the pretreatment chemistry. bSpecimen also identified in previous article [39].

Fig 3

doi: https://doi.org/10.1371/journal.pone.0169486.g003