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GSA Bulletin; March 2008; v. 120; no. 3-4; p. 487-511; DOI: 10.1130/B25988.1
© 2008 Geological Society of America
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Integrated stratigraphy of the Oligocene pelagic sequence in the Umbria-Marche basin (northeastern Apennines, Italy): A potential Global Stratotype Section and Point (GSSP) for the Rupelian/Chattian boundary

Rodolfo Coccioni{dagger},1, Andrea Marsili1, Alessandro Montanari2,3, Adriana Bellanca4, Rodolfo Neri4, David M. Bice5,6, Henk Brinkhuis7, Nathan Church8,9, Alison Macalady8,9, Aaron McDaniel8,9, Alain Deino10, Fabrizio Lirer11, Mario Sprovieri11, Patrizia Maiorano12, Simonetta Monechi13, Claudio Nini14, Marisa Nocchi15, Jörg Pross16, Pierre Rochette17, Leonardo Sagnotti18, Fabio Tateo19, Yannick Touchard20, Stefaan Van Simaeys21 and Graham L. Williams22

1 Istituto di Geologia e Centro di Geobiologia dell'Università degli Studi "Carlo Bo," Campus Scientifico, Località Crocicchia, 61029 Urbino, Italy
2 Osservatorio Geologico di Coldigioco, 62020 Frontale di Apiro, Italy
3 Department of Geology, Carleton College, Northfield, Minnesota 55057, USA
4 Dipartimento di Chimica e Fisica della Terra ed Applicazioni alle Georisorse e ai Rischi Naturali (CFTA), Via Archirafi 36, 90123 Palermo, Italy
5 Department of Geosciences, the Pennsylvania State University, University Park, Pennsylvania 16802, USA
6 Osservatorio Geologico di Coldigioco, 62020 Frontale di Apiro, Italy
7 Laboratory of Palaeobotany and Palynology, Utrecht University, Budapestaan 4, 3584 CD Utrecht, The Netherlands
8 Department of Geology, Carleton College, Northfield, Minnesota 55057, USA
9 Osservatorio Geologico di Coldigioco, 62020 Frontale di Apiro, Italy
10 Berkeley Geochronology Center, 2453 Ridge Road, Berkeley, California 94709, USA
11 Istituto Ambiente Marino Costiero (IAMC)–CNR, Calata Porta di Massa, Interno Porto di Napoli, 80123 Napoli, Italy
12 Dipartimento di Geologia e Geofisica dell'Università degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy
13 Dipartimento di Scienze della Terra dell'Università degli Studi di Firenze, Via La Pira 4, 50121 Firenze, Italy
14 Ente Nazionale Idrocarburi (ENI) S.p.A., Exploration and Production Division, Via Emilia 1, 20097 San Donato Milanese, Italy
15 Dipartimento di Scienze della Terra dell'Università, Piazza Università 1, 06100 Perugia, Italy
16 Institut für Geowissenschaften, Johann Wolfgang Goethe–Universität Frankfurt, Senckenberganlage 32-34, D-60054 Frankfurt, Germany
17 Université d'Aix Marseille 3, UMR CNRS 6635, CEREGE Europole de l'Arbois BP80 13545 Aix en Provence Cedex 4, France
18 Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy
19 Istituto di Geoscienze e Georisorse-CNR, c/o Dipartimento di Geologia, Paleontologia e Geofisica, Via Giotto 1, 35137 Padova, Italy
20 Université d'Aix Marseille 3, UMR CNRS 6635, CEREGE Europole de l'Arbois BP80 13545 Aix en Provence Cedex 4, France
21 Historical Geology, University of Leuven, Redingenstraat 16, B-3000 Leuven, Belgium
22 Geological Survey of Canada, Bedford Institute of Oceanography, PO Box 1006, Dartmouth, Nova Scotia, B2Y 4A2, Canada

The Oligocene represents an important time period from a wide range of perspectives and includes significant climatic and eustatic variations. The pelagic succession of the Umbria-Marche Apennines (central Italy) includes a complete and continuous sequence of marly limestones and marls, with volcaniclastic layers that enable us to construct an integrated stratigraphic framework for this time period. We present here a synthesis of detailed biostratigraphic, magnetostratigraphic, and chemostratigraphic studies, along with geochronologic results from several biotite-rich volcaniclastic layers, which provide the means for an accurate and precise radiometric calibration of the Oligocene time scale. From this study, the interpolated ages for the Rupelian/Chattian stage boundary, located in the upper half of Chron 10n at meter level 188 in the Monte Cagnero section, and corresponding to the O4/O5 planktonic foraminiferal zonal boundary, are 28.36 Ma (paleomagnetic interpolation), 28.27 ± 0.1 Ma (direct radioisotopic dating), and 27.99 Ma (astrochronological interpolation). These ages appear to be slightly younger than those reported in recent chronostratigraphic time scale compilations. The Monte Cagnero section is a potential candidate for defining the Chattian Global Stratotype Section and Point (GSSP) and some reliable criteria are here proposed for marking the Rupelian/Chattian boundary according to International Union of Geological Sciences (IUGS) recommendations.

Key Words: Integrated stratigraphy • Oligocene • Rupelian/Chattian boundary • Umbria-Marche Apennines • central Italy






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