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John Reynolds (Berkeley) and Robert N. Clayton (Chicago) at Gregynog for the 1976 Workshop on Isotopic Anomalies, which was organized by D. Clayton. See 1976 Gregynog Group for more details of this historic workshop. These two are the great pioneers of isotopic anomalies in meteorites. Reynolds discovered the three great xenon anomalies in meteorites, deriving from extinct 129I, from extinct 244Pu, and from Xe-HL carried by interstellar diamonds (not known in 1976). Robert Clayton opened the isotopic anomaly box in 1973 with his discovery of excess 16O within Allende refractory minerals. These discoveries inspired theoretical papers that laid the conceptual groundwork for interpretation and also of presolar STARDUST grains (which were not isolated until 1987).

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