Lunar impact cratering serves as a vital method for dating planetary surfaces. While radiometric dating of lunar samples establishes an absolute age reference, crater-chronology functions for the Moon are still inadequately defined for ages exceeding 3.9 billion years. In our study, we utilized high-precision dating and textural analyses of accessory minerals from the Mg suite of Apollo 16 and 17 samples to uncover "ancient" impact records. This presentation will focus on our findings, which indicate impact events occurring around 4.22 billion years ago, linked to the formation of the Serenitatis Basin. Our research underscores the complexities involved in dating lunar basins, including the effects of regolith mixing and the difficulty of distinguishing between separate impact events, as well as elucidating the origin of the Mg suite. These results will help refine lunar chronology, especially concerning the debated ages of large ancient basins such as Serenitatis and the potential composition of the impactor(s).

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