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Updated Aragonian biostratigraphy: Small Mammal distribution and its implications for the Miocene European Chronology

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Meulen, Albert J. van der and García Paredes, Israel and Álvarez Sierra, María Ángeles and Hoek Ostende, L. W. van den and Kordijk, K. and Oliver Pérez, Adriana and Peláez-Campomanes de Labra, Pablo (2012) Updated Aragonian biostratigraphy: Small Mammal distribution and its implications for the Miocene European Chronology. Geologica acta, 10 (2). pp. 159-179. ISSN 1695-6133

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Abstract

This paper contains formal definitions of the Early to Middle Aragonian (Late Early–Middle Miocene) smallmammal
biozones from the Aragonian type area in North Central Spain. The stratigraphical schemes of two of the
best studied areas for the Lower and Middle Miocene, the Aragonian type area in Spain and the Upper Freshwater
Molasse from the North Alpine Foreland Basin in Switzerland, have been compared. This comparison allows
the analysis of the order of shared mammal events in the two countries, and the quantification of the resulting
asynchronies based on their temporal correlations. The order of the events is very similar in Spain and Switzerland.
In order to estimate the diachrony, two age-model options are used for the Swiss record. Our preferred option
yields no discrepancies with SW European paleomagnetic and radiometric calibrations of the Ramblian and Early
Aragonian bioevents. All Swiss first taxa occurrences precede those in the Aragonian type area by 0.74Myr on
average. The asynchronies (1-2Myr) of the species arriving in the Late Middle to Early Late Aragonian may be
higher than in the Early Aragonian (0-1Myr). The implications for the biochronological mammal Neogene system
are discussed. Evidence is given confirming the unfeasibility of a formal European biozonation, since it is realised,
that 1) most indicator species and many genera of rodents yielding the most detailed zonations have limited
geographical ranges hampering recognition of the mammal Neogene zones; and 2) first and last taxon occurrences
are diachronical. Therefore, the mammal Neogene system based on a sequence of time-ordered reference localities
is preferred to the one based on selected bioevents “developed in widespread geographic areas”.


Item Type:Article
Uncontrolled Keywords:Rodents, Lagomorphs, Insectivores, Miocene, Faunal events
Subjects:Sciences > Geology > Paleontology
ID Code:25565
Deposited On:26 May 2014 11:49
Last Modified:11 Dec 2018 08:42

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