Biostratigraphic significance of sequential size variations of the calcareous nannofossil genus Reticulofenestra in the Upper Pliocene of the North Atlantic |
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| Affiliation: | 1. Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium;2. Institut für Geophysik und Geologie, Universität Leipzig, Leipzig, Germany;3. Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover, Germany;1. Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, via E. Orabona 4, 70125 Bari, Italy;2. Dipartimento di Scienze della Terra, Università degli Studi di Firenze, via G. La Pira 4, 50121 Firenze, Italy;1. Dipartimento di Scienze della Terra “A. Desio”, Università degli Studi di Milano, via Mangiagalli 34, 20133 Milan, Italy;2. Department of Geology, University of Vienna, Althanstraße 14, Vienna 1090, Austria;3. Department of Geological Sciences, University of Missouri-Columbia, Columbia, MO 65211, USA;4. National Museum of Natural History, Smithsonian Institution, MRC-121, Washington, DC 20013, USA;5. Department of Earth and Atmospheric Sciences, University of Nebraska, Lincoln, NE 68588, USA |
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| Abstract: | We demonstrate size fluctuations of the calcareous nannofossil genus Reticulofenestra in Upper Pliocene sediments from the North Atlantic Ocean and clarify a characteristic evolutionary trend of this genus. Four bioevents, which are based on abrupt decreases in maximum size and on changes of morphologic features of Reticulofenestra specimens, are detected in the sediments. They are the disappearance of R. minutula var. A, the termination of Acme Zone II of R. minutula var. C, the disappearance of R. minutula var. B, and the termination of Acme Zone I of R. minutula var. C, in ascending order. These are nearly synchronous and traceable events. |
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