Using Rapid Atmospheric ¹⁴c Changes in the 7th Century Bc to Precisely Date the Floating Chronology for Pine Wood From Józefowo (Northern Poland)

The floating dendrochronological sequence of pine wood from Józefowo, N. Poland was expected to cover the ∼660 BC radiocarbon ( 14 C) excursion. The sequence was radiocarbon dated using the OxCal wiggle matching procedure and the IntCal20 calibration curve. 14 C concentrations were measured in one-year α-cellulose samples from around 660 BC. The published data on the ∼660 BC 14 C excursion from Grabie, Poland were used to absolute date the Józefowo chronology with 1-year accuracy. The results confirm the occurrence of a rapid increase in Δ 14 C in 664/663 BC and its potential to be used as a fixing point for floating dendrochronological sequences.