The magnetobiochronological dating of the late Miocene hipparionine horses (“Hipparion”) in the western Mediterranean places its first appearance datum (FAD) in the circum-Mediterranean region at the Chron C5r, at a minimum age of 11.1 Ma. This date challenges some of the widely accepted datings of this bioevent in western Eurasia and is relevant to the discussion of the mode and tempo of “Hipparion” dispersal. The migration of the “Hipparion” North American ancestor is related to the glacioeustatic sea-level lowstand of the supercycle TB3.1 (early Tortonian) and to the concurrent deep-sea hiatus NH4 and oceanic δ18O isotopic event Mi5. The “Hipparion” dispersal was a conspicuous, worldwide, on-land bioevent that was coeval with major late Miocene oceanic and high-latitude paleoclimatic global changes.

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