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Authors: Coccioni, R.*
Marsili, A.*
Montanari, A.*
Bellanca, A.*
Neri, R.*
Bice, D. M.*
Brinkhuis, H.*
Church, N.*
Macalady, A.*
McDaniel, A.*
Deino, A.*
Lirer, F.*
Sprovieri, M.*
Maiorano, P.*
Monechi, S.*
Nini, C.*
Nocchi, M.*
Pross, J.*
Rochette, P.*
Sagnotti, L.*
Tateo, F.*
Touchard, Y.*
Van Simaeys, S.*
Williams, G. L.*
Title: 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
Title of journal: GSA Bulletin
Series/Report no.: 3-4 / 120 (2008)
Publisher: Geological Society of America
Issue Date: 2008
DOI: 10.1130/B25988.1
Keywords: Integrated stratigraphy
Rupelian/Chattian boundary
Umbria-Marche Apennines, central Italy
Abstract: 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.
Appears in Collections:04.05.06. Paleomagnetism
04.04.10. Stratigraphy
Papers Published / Papers in press

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