dc.contributor |
Universitat de Barcelona |
dc.contributor.author |
Costa Gisbert, Elisenda |
dc.contributor.author |
Garcés Crespo, Miguel |
dc.contributor.author |
Sáez, Alberto |
dc.contributor.author |
Cabrera, Lluís |
dc.contributor.author |
López Blanco, Miguel |
dc.date |
2011 |
dc.identifier.citation |
0031-0182 |
dc.identifier.uri |
http://hdl.handle.net/2445/34510 |
dc.format |
11 p. |
dc.format |
application/pdf |
dc.language.iso |
eng |
dc.publisher |
Elsevier B.V. |
dc.relation |
Palaeogeography Palaeoclimatology Palaeoecology, 2011, vol. 301, num. 1-4, p. 97-107 |
dc.rights |
(c) Elsevier B.V., 2011 |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Mamífers fòssils |
dc.subject |
Eocè |
dc.subject |
Oligocè |
dc.subject |
Ebre, Depressió de l' |
dc.subject |
Fossil mammals |
dc.subject |
Eocene Epoch |
dc.subject |
Oligocene |
dc.subject |
Ebro River Watershed (Spain) |
dc.title |
The age of the"Grande Coupure" mammal turnover: New constraints from the Eocene Oligocene record of the Eastern Ebro Basin (NE Spain.) |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/acceptedVersion |
dc.description.abstract |
The Grande Coupure represents a major terrestrial faunal turnover recorded in Eurasia associated with the overall climate shift at the Eocene-Oligocene transition. During this event, a large number of European Eocene endemic mammals became extinct and new Asian immigrants appeared. The absolute age of the Grande Coupure, however, has remained controversial for decades. The Late Eocene-Oligocene continental record of the Eastern Ebro Basin (NE Spain) constitutes a unique opportunity to build a robust magnetostratigraphy- based chronostratigraphy which can contribute with independent age constraints for this important turnover. This study presents new magnetostratigraphic data of a 495-m-thick section (Moià-Santpedor) that ranges from 36.1 Ma to 33.3 Ma. The integration of the new results with previous litho- bio- and magnetostratigraphic records of the Ebro Basin yields accurate ages for the immediately pre- and post-Grand Coupure mammal fossil assemblages found in the study area, bracketing the Grande Coupure to an age embracing the Eocene-Oligocene transition, with a maximum allowable lag of 0.5 Myr with respect to this boundary. The shift to drier conditions that accompanied the global cooling at the Eocene-Oligocene transition probably determined the sedimentary trends in the Eastern Ebro Basin. The occurrence and expansion of an amalgamated-channel sandstone unit is interpreted as the forced response of the fluvial fan system to the transient retraction of the central-basin lake systems. The new results from the Ebro Basin allow us to revisit correlations for the controversial Eocene-Oligocene record of the Hampshire Basin (Isle of Wight, UK), and their implications for the calibration of the Mammal Palaeogene reference levels MP18 to MP21. |