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Bayesian-derived highest probability ranges for the periods of lineage turnover of D. torquatus, based on AMS dated samples. Collared lemming lineage turnover events are shaded red and labeled A–D; gray box: M. primigenius absence, from AMS dated samples (21). cal BP, calibrated years Before Present; GI, Greenland Interstadials; NGRIP 18O, NorthGRIP 18O data (19).
