Options
Williams, Graham
Loading...
Preferred name
Williams, Graham
Alternative Name
Williams, G L
2 results
Now showing 1 - 2 of 2
- PublicationOpen AccessThe Global Stratotype Section and Point (GSSP) for the base of the Chattian Stage (Paleogene System, Oligocene Series) at Monte Cagnero, Italy(2018-03)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ; ;The GSSP for the base of the Chattian Stage (Paleogene System, Oligocene Series) is defined at meter level 197 in the Monte Cagnero section, which belongs to the pelagic succession of the Umbria–Marche basin (Urbania, central Italy: 43°38′47.81″N–12°28′03.83″E). This level with an astronomical age of 27.82 Ma coincides with the highest common occurrence of the planktonic foraminifer Chiloguembelina cubensis at the base of planktonic foraminiferal O5 Zone and falls in the upper part of calcareous nannofossil NP24 Zone, in the lower part of dinocyst Dbi Zone, and in the lower Chron C9n. The proposal was approved by the International Subcommission of Paleogene Stratigraphy in July 2015, approved by the International Commission of Stratigraphy in August 2016, and ratified by the International Union of Geological Sciences in September 2016.249 139 - PublicationRestrictedIntegrated 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(2008)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;Coccioni, R.; Istituto di Geologia e Centro di Geobiologia dell’Università degli Studi “Carlo Bo,” Campus Scientifi co, Località Crocicchia, 61029 Urbino, Italy ;Marsili, A.; Istituto di Geologia e Centro di Geobiologia dell’Università degli Studi “Carlo Bo,” Campus Scientifi co, Località Crocicchia, 61029 Urbino, Italy ;Montanari, A.; Osservatorio Geologico di Coldigioco, 62020 Frontale di Apiro, Italy - Department of Geology, Carleton College, Northfi eld, Minnesota 55057, USA ;Bellanca, A.; Dipartimento di Chimica e Fisica della Terra ed Applicazioni alle Georisorse e ai Rischi Naturali (CFTA), Via Archirafi 36, 90123 Palermo, Italy ;Neri, R.; Dipartimento di Chimica e Fisica della Terra ed Applicazioni alle Georisorse e ai Rischi Naturali (CFTA), Via Archirafi 36, 90123 Palermo, Italy ;Bice, D. M.; Department of Geosciences, the Pennsylvania State University, University Park, Pennsylvania 16802, USA - Osservatorio Geologico di Coldigioco, 62020 Frontale di Apiro, Italy ;Brinkhuis, H.; Laboratory of Palaeobotany and Palynology, Utrecht University, Budapestaan 4, 3584 CD Utrecht, The Netherlands ;Church, N.; Department of Geology, Carleton College, Northfi eld, Minnesota 55057, USA - Osservatorio Geologico di Coldigioco, 62020 Frontale di Apiro, Italy ;Macalady, A.; Department of Geology, Carleton College, Northfi eld, Minnesota 55057, USA - Osservatorio Geologico di Coldigioco, 62020 Frontale di Apiro, Italy ;McDaniel, A.; Department of Geology, Carleton College, Northfi eld, Minnesota 55057, USA - Osservatorio Geologico di Coldigioco, 62020 Frontale di Apiro, Italy ;Deino, A.; Berkeley Geochronology Center, 2453 Ridge Road, Berkeley, California 94709, USA ;Lirer, F.; Istituto Ambiente Marino Costiero (IAMC)–CNR, Calata Porta di Massa, Interno Porto di Napoli, 80123 Napoli, Italy ;Sprovieri, M.; Istituto Ambiente Marino Costiero (IAMC)–CNR, Calata Porta di Massa, Interno Porto di Napoli, 80123 Napoli, Italy ;Maiorano, P.; Dipartimento di Geologia e Geofi sica dell’Università degli Studi di Bari, Via Orabona 4, 70125 Bari, Italy ;Monechi, S.; Dipartimento di Scienze della Terra dell’Università degli Studi di Firenze, Via La Pira 4, 50121 Firenze, Italy ;Nini, C.; Ente Nazionale Idrocarburi (ENI) S.p.A., Exploration and Production Division, Via Emilia 1, 20097 San Donato Milanese, Italy ;Nocchi, M.; Dipartimento di Scienze della Terra dell’Università, Piazza Università 1, 06100 Perugia, Italy ;Pross, J.; Institut für Geowissenschaften, Johann Wolfgang Goethe–Universität Frankfurt, Senckenberganlage 32-34, D-60054 Frankfurt, Germany ;Rochette, P.; Université d’Aix Marseille 3, UMR CNRS 6635, CEREGE Europole de l’Arbois BP80 13545 Aix en Provence Cedex 4, France ;Sagnotti, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Tateo, F.; Istituto di Geoscienze e Georisorse-CNR, c/o Dipartimento di Geologia, Paleontologia e Geofi sica, Via Giotto 1, 35137 Padova, Italy ;Touchard, Y.; Université d’Aix Marseille 3, UMR CNRS 6635, CEREGE Europole de l’Arbois BP80 13545 Aix en Provence Cedex 4, France ;Van Simaeys, S.; Historical Geology, University of Leuven, Redingenstraat 16, B-3000 Leuven, Belgium ;Williams, G. L.; 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.255 22