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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
Issue Date: 2008
Series/Report no.: 3-4 / 120 (2008)
DOI: 10.1130/B25988.1
Keywords: Integrated stratigraphy
Rupelian/Chattian boundary
Umbria-Marche Apennines, central Italy
Subject Classification04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy 
04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism 
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.
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