Stable Isotope Tree-Ring Dates: List 2

INTRODUCTION Recent developments in UK dendrochronology have shown that cross-dating of annually resolved tree-ring stable isotope sequences from oak latewood cellulose provides an extremely effective precision dating method. The method is outlined in Miles et al. (2019) and is described in more detail in Loader et al. (2019). We report here the second date list for stable isotope dated samples. This list includes dates for timbers from south-west Wales, a region where young, fast-grown timbers frequently occur in the historic buildings archive and ring-width dendrochronology is challenging. We also present isotope dating of elm samples, a timber noted by Martin Bridge (this volume, pp. 94–102) as the second commonest structural timber in British buildings, that has proved very difficult to date using ring-widths. For some buildings where isotope dendrochronology has established or confirmed the dating of more extensive ring-width assemblages, details are given in the main tree-ring date lists, with only the isotope dating presented here. When the date is included only in this list, information on the measured isotope series precedes that for the ring-width samples. All samples are oak unless otherwise stated. For the Welsh sites, historic counties are given, since this is the policy adopted in the Welsh tree-ring date lists. The NPRN numbers at the end of Welsh site descriptions refer to the entry on Coflein, the online database of the Royal Commission on the Ancient and Historic Monuments of Wales. Stable isotope dating for Twilly Spring, West Hendred, Oxfordshire is reported in Radiocarbon Date List 6, No. 9 (p. 106).