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Magnetostratigraphic dating of the middle Miocene climate change in the continental deposits of the Aragonian type area in the Calatayud-Teruel basin (Central Spain)

By W. Krijgsman, C.G. Langereis, R. Daams and A.J. van der Meulen


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 [1]. 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 [2]. 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 [3]. 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)

Topics: Aardwetenschappen
Year: 1994
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