Photographs and analytical data of zircons used for Uranium‒ lead dating of zircons from an ash-fall tuff in the Kinbusan area, eastern Tottori Prefecture, Japan．

For details of the dating sample (KB01), refer Haji (2024; 10.5575/geosoc.2024.0027).

Fig. S1. (a) Photomicrograph and (b) cathodoluminescence images of the analyzed zircons. Yellow squares in (b) indicate ablation spots. The scale in (b) is 20 μm.

Table S1. Instrumentation and operating conditions of the femtosecond LA–MC–ICP–MS.

Table S2. Isotopic data and U‒Pb ages of zircons with 2σ uncertainties (first routine). "*": discordant data. "y": data of the young cluster. "o": data of the old cluster.

Table S3. Isotopic data and U‒Pb ages of zircons with 2σ uncertainties (second routine). "*": discordant data. "y": data of the young cluster. "o": data of the old cluster.