Radiocarbon variations from the Southern Hemisphere, 10,350-9700 cal BP

We have made AMS measurements on a series of 10-ring samples from a subfossil Huon pine log found in western Tasmania (42 deg. S, 145 deg. E). The results show a pronounced rise in Δ14C over the first 200 years, and a decrease over the following 160 years. Tree-ring width measurements indicate that this log (catalogue SRT-447) can be cross-dated with another subfossil log (SRT-416) for which a series of high-precision radiometric 14C measurements have previously been made. When the two tree-ring series are thus aligned, SRT-447 is the older of the two logs, and there is a 139-year overlap. We then have a Huon pine floating chronology spanning 680 years, with 14C measurements attached. The 14C data sets agree well within the period of overlap indicated by the tree-rings. The 14C variations from Huon pine show excellent agreement with those from German oak and pine for the period 10,350-9670 cal BP. Aligning the Huon pine 14C series with that from German oak and pine allows us to examine the inter-hemispheric offset in 14C dates in the early Holocene