Following the initial mapping process, the mica samples underwent a re-investigation using conventional analysis, employing static spot ablation to validate the accuracy of the mapped age distribution (Fig. ). This verification procedure was conducted in two separate sessions, namely "GER2B/Wil1A spot" and "GÄD08 spot". Moreover, the single crystal reference materials were analyzed during an additional session by randomly placing 28-30 spots across the single crystal to assess both the composition and the uniformity of the Rb-Sr age signal. This session is referred to as "homogeneity,". The same interface tubing is used for the aerosol transport, but another higher volume glass adapter from Glass Expansion is installed before the ICP plasma inlet as a signal smoothing device. The tuning procedure was identical to the dwell times compiled in Table . While 85 Rb was acquired in analog mode, ~ 86 Sr and ~ 87 Sr were always acquired in pulse mode. In NIST610, ~ 88 Sr is acquired in analog mode but in pulse mode for all mica samples, hence being the only non-P/A matched nuclide during spot analysis.