The exceptionally dense mammalian faunal record of the Aragonian type area in Central Spain shows that an\ud important climate change towards a cooler and more humid climate is recorded during the Neogene Mammal Zone\ud MN 5 . The magnetostratigraphic results from mammal-bearing middle Miocene continental sections in the\ud Aragonian type area indicate that the onset of this climate change, at the MN 4/MN 5 boundary, occurs in the\ud reversed chron C5ACr and has an age of 14.1 Ma, according to the geomagnetic polarity timescale (GPTS) of Cande\ud and Kent . This age is consistent with the age estimate of 14.1-14.05 Ma for the main increase in 6 ~SO in the\ud marine record . These independent observations of time-equivalent cooling in both continental and marine\ud records confirm and accurately date a global cooling event in the middle Miocene.\ud The age of 14.1 Ma for the MN 4/MN 5 boundary is significantly younger than previously recorded in continental\ud timescales [4,5]. This results in a longer duration, by approximately 3 Myr, of the MN 4 zone, which is consistent with\ud the many important faunal changes occurring in MN 4. Furthermore, the MN 5/MN 6 boundary occurs in chron\ud C5ACn (13.8-13.9 Ma) and the MN 6/MN 7-8 boundary in the interval C5Ar.ln-C5Ar.3r (12.7-13.0 Ma)
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