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1. Langhian: The Langhian is, in the ICS geologic timescale, an age or stage in the middle Miocene Epoch/Series. It spans the time between 15.97 ± 0.05 Ma and 13.65 ± 0.05 Ma (million years ago) during the Middle ... (Earth) [100%] 2023-07-09 [Langhian] [Langhian first appearances]...