Archaeologists have finally solved a 127-year-old mystery surrounding a coffin that fell from a cliff near Bagicz, Poland, in 1899. The wooden sarcophagus, made from a hollowed oak trunk, protected the remains of a young woman from the Wielbark culture. Radiocarbon dating revealed the woman died a century before her coffin was made, creating a puzzling discrepancy.

Initially thought to be an elite member of society due to grave goods including a bronze fibula, glass and amber necklace, and bronze bracelets, further analysis showed the burial was typical of Roman Iron Age Poland. The coffin's exceptional preservation occurred in an anoxic environment caused by rising water levels submerging coastal land. Archaeologist Marta Chmiel-Chrzanowska led the investigation, using updated dendrochronological methods to date the wood between 112 and 128 C.E.

Scientists theorize the dating discrepancy resulted from the woman's high-protein diet, possibly including fish or non-local foods. Marine carbon contains lower levels of carbon-14, which can artificially age radiocarbon results. This finding is crucial for improving future radiocarbon dating interpretations, especially in regions with high water hardness. The discovery also raises questions about mobility and cultural exchanges during the Roman Iron Age in Poland.