Updated Aragonian biostratigraphy: Small Mammal distribution and its implications for the Miocene European Chronology
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| Format: | Artículo científico |
| Langue: | en |
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Universitat de Barcelona
2012
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| _version_ | 1876471762860900352 |
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| author | A.J. van der Meulen |
| author_facet | A.J. van der Meulen |
| contents | Updated Aragonian biostratigraphy: Small Mammal distribution and its implications for the Miocene European Chronology A.J. van der Meulen I. García-Paredes M.A. Álvarez-Sierra L.W. van den Hoek Ostende K. Hordijk A. Oliver P. Peláez-Campomanes Ciencias de la Tierra Rodents Miocene Lagomorphs Insectivores Faunal events 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 mammalNeogene 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". 2012 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50524522005 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.10 |
| format | Artículo científico |
| id | redalyc_50524522005 |
| institution | Redalyc |
| language | en |
| publishDate | 2012 |
| publisher | Universitat de Barcelona |
| spellingShingle | Updated Aragonian biostratigraphy: Small Mammal distribution and its implications for the Miocene European Chronology A.J. van der Meulen Ciencias de la Tierra Rodents Miocene Lagomorphs Insectivores Faunal events Updated Aragonian biostratigraphy: Small Mammal distribution and its implications for the Miocene European Chronology A.J. van der Meulen I. García-Paredes M.A. Álvarez-Sierra L.W. van den Hoek Ostende K. Hordijk A. Oliver P. Peláez-Campomanes Ciencias de la Tierra Rodents Miocene Lagomorphs Insectivores Faunal events 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 mammalNeogene 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". 2012 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50524522005 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.2 Vol.10 |
| title | Updated Aragonian biostratigraphy: Small Mammal distribution and its implications for the Miocene European Chronology |
| topic | Ciencias de la Tierra Rodents Miocene Lagomorphs Insectivores Faunal events |
| url | https://www.redalyc.org/articulo.oa?id=50524522005 |