Reservoir effect radiocarbon dating

To confirm the dating of this individual and better clarify the ages of the associated material culture, we undertook additional radiocarbon dating, including two separate dates directly on the individual himself.We also re-dated the hat and robe fragments reported earlier, obtaining dates that were younger than initially reported but similar to the new dates we obtained on associated artifacts and on the Kwädąy Dän Ts’ìnchį man himself.These freshwater reservoir offsets (FROs) have been noted on human and dog bone in several areas of the world.

Differences from within each of four pairs of wood charcoal vs.marine shell (Nunivak Island) produce a weighted mean of 459 ± 32 years.Differences from within each of 14 pairs of wood charcoal vs. Lawrence Island, Cape Prince of Wales, Nunivak Island, Alaska Peninsula, and Unalaska Island) yield a weighted mean of 737 ± 20 years.Somewhat more variant differences from within each of five additional pairs of wood charcoal vs. Lawrence Island, Unalaska Island) provide a lower weighted mean of 460 ± 41 years.Overall, the effect throughout the eastern Bering Sea appears to range from about 450 to 750 years.

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more Isotopic analysis of dog (Canis lupus familiaris) bone recovered from archaeological sites as proxies for human bone is becoming common in North America.

Chronological placement of the dogs is often determined through radiocarbon dating of dog bone.

Carbon-14 age determinations from 23 paired samples of terrestrial and marine origin are presented for five areas around the northern and eastern Bering Sea.

It appears statistically suitable to average the age differences for three pairs, weighted inversely by variance.

The first series of radiocarbon dates on this associated material ranged from 500 to 120 Before Present, indicating that the area is a multi-phase site where various organic objects were deposited over at least a 400 radiocarbon-year time period.