In my my tree ring book, I focused nearly entirely on their use in studying climates. But tree rings are good for so much more, as in this example:

Earlier this week, Royal Commission staff visited the Conwy valley, to work with Margaret Dunn, the director of the Dating Old Welsh Houses project in evaluating the final batch of houses, which will now be tree-ring dated by Dr Dan Miles and Dr Martin Bridge from the Oxford Dendrochronology Laboratory. Working in partnership with the Royal Commission, Dating Old Welsh Houses is a community-based history project focused on dating historic houses in the counties of North-west Wales and then compiling their house histories. In the last three years over sixty houses have been successfully dated by the partnership project and revealed some remarkable results. Contrary to the traditional view that North Wales was an architectural backwater in terms of houses, the results of the project show that the characteristic Snowdonian house took shape in the early sixteenth-century much earlier than previously believed.