OLD-WORLD FIRST APPEARANCE DATUM OF HIPPARION HORSES - LATE MIOCENE LARGE-MAMMAL DISPERSAL AND GLOBAL EVENTS

The magnetobiochronological dating of the late Miocene hipparionine ho rses (''Hipparion'') in the western Mediterranean places its first app earance datum (FAD) in the circum-Mediterranean region at the Chron C5 r, at a minimum age of 11.1 Ma, This date challenges some of the widel y accepted datings of this bioevent in western Eurasia and is relevant to the discussion of the mode and tempo of ''Hipparion'' dispersal. T he migration of the ''Hipparion'' North American ancestor is related t o the glacioeustatic sea-level lowstand of the supercycle TB3.1 (early Tortonian) and to the concurrent deep-sea hiatus NH4 and oceanic delt a(18)O isotopic event Mi5. The ''Hipparion'' dispersal was a conspicuo us, worldwide, on-land bioevent that was coeval with major late Miocen e oceanic and high-latitude paleoclimatic global changes.