The Ramblian-Aragonian boundary and its significance for the European Neogene continental chronology. Contributions from the Ebro Basin record (NE Spain)

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• 作者：Jordi Agust&#xed ; ^a ; ^{jordi.agusti@icrea.es"" rel=""nofollow} ; Francisco J. Pé ; rez-Rivaré ; s^b ; Lluis Cabrera^c ; Miguel Garcé ; s^c ; Gonzalo Pardo^b ; Concha Arenas^b
• 关键词：Early Miocene ; Middle Miocene ; Rodents ; Cricetids ; Glirids ; Magnetobiostratigraphy
• 刊名：Geobios
• 出版年：2011
• 出版时间：March-June 2011
• 年：2011
• 卷：44
• 期：2-3
• 页码：121-134
• 全文大小：1463 K

文摘

In this paper we report on the results of a paleontological and paleomagnetic sampling carried out in the Miocene of the central Ebro Basin. It includes the sections of Albalatillo, Lanaja, La Almolda and San Caprasio in the Sierra de Alcubierre, which delivered six new micromammal levels ranging from the MN3 to MN5 mammal units. The magnetobiostratigraphic study of the Sierra de Alcubierre enables one to shed light on the chronology of the Early to Middle Miocene European mammal biozonation (e.g., the Ramblian-Aragonian boundary). As a result, the first occurrence of the “Miocene Cricetids” and, therefore, the lower boundary of MN4 – zone B, is set back to the lower part of chron C5Cr, thus reducing significantly the supposed discrepancy of the First Occurrence of Democricetodon in the Swiss Molasse and the Aragonian type-section. Another significant result is the persistence of Vasseuromys in the Ebro Basin up to the Middle Miocene (MN5).