Correlation between the Paleocene/Eocene boundary and the Ilerdian at Campo, Spain |
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Authors: | Eustoquio Molina Eugenia AngoriIgnacio Arenillas Henk BrinkhuisErica M Crouch Hanspeter LuterbacherSimonetta Monechi Birger Schmitz |
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Institution: | a Departamento de Ciencias de la Tierra, Universidad de Zaragoza, 50009 Saragossa, Spainb Dipartimento di Scienze della Terra, Università di Firenze, 50121 Florence, Italyc Laboratory of Palaeobotany and Palynology, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlandsd Institut und Museum für Geologie und Paläontologie, Universität Tübingen, Sigwartstrasse 10, 72076 Tübingen, Germanye Marine Geology, Earth Sciences Centre, 40530 Gothenburg, Sweden |
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Abstract: | The Ilerdian is a well-established Tethyan marine stage, which corresponds to an important phase in the evolution of larger foraminifera not represented in the type-area of the classical Northwest-European stages. This biostratigraphic restudy of its parastratotype in the Campo Section (northeastern Spain) based on planktic foraminifera, calcareous nannofossils, dinoflagellate cysts and the distribution of the stable isotopes ∂13C and ∂18O is an attempt to correlate the Paleocene/Eocene boundary based on a characteristic carbon isotope excursion (CIE) marking the onset of the Initial Eocene Thermal Maximum (IETM) and the Ilerdian stage. The base of this ∂13C excursion has been chosen as the criterion for the recent proposal of the Global Stratotype Section and Point (GSSP) of the base of the Eocene (= base of the Ypresian) in the Dababiya Section (Egypt) to which an age of 54.9 Ma has been attributed. This level is also characterized by a marked extinction among the deep-water benthic foraminifera (Benthic Foraminifera Extinction Event, BFEE), a flood of representatives of the planktic foraminiferal genus Acarinina and the acme of dinoflagellate cysts of the genus Apectodinium. In the Campo Section, detailed biozonations (planktic foraminifera, calcareous nannofossils, dinoflagellate cysts) are recognized in the Lower and Middle Ilerdian. The correlation with the Ypresian stratotype is based on dinoflagellate cysts and calcareous nannofossils. The base of the Ilerdian is poor in planktic microfossils and its precise correlation with the redefined Paleocene/Eocene boundary remains uncertain. |
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Keywords: | Ilerdian Paleocene Eocene Chronostratigraphy Biostratigraphy Integrated stratigraphy Spain |
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