Paper No. 177-10
Presentation Time: 3:50 PM
THE GLOBAL BOUNDARY STRATOTYPE SECTION AND POINT (GSSP) FOR THE BASE OF THE CONIACIAN STAGE (SALZGITTER-SALDER, GERMANY) AND ITS AUXILIARY SECTIONS (SŁUPIA NADBRZEŻNA, CENTRAL POLAND; STŘELEČ, CZECH REPUBLIC; AND EL ROSARIO, NE MEXICO) (Invited Presentation)
WALASZCZYK, Irek1, CECH, Stanislav2, CRAMPTON, James S.3, DUBICKA, Zofia1, IFRIM, Christina4, JARVIS, Ian5, KENNEDY, William J.6, LEES, Jackie A.7, LODOWSKI, Damian1, PEARCE, Martin8, PERYT, Daunta9, SAGEMAN, Bradley B.10, SCHIØLER, Poul11, TODES, Jordan12, ULIČNÝ, David13, VOIGT, Silke14 and WIESE, Frank15, (1)Faculty of Geology, University of Warsaw, Zwirki i Wigury 93, Warsaw, 02-089, Poland, (2)Cech Geological Survey, Klárov 3/131, Praha, 118 21, Czech Republic, (3)School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, PO Box 600, New Zealand, (4)SNSB Jura-Museum, Willbaldsburg, Burgstr. 19, Eichstätt, 85072, Germany, (5)Department of Geography, Geology and the Environment, Kingston University London, Kingston upon Thames, KT1 2EE, United Kingdom, (6)Museum of Natural History, Oxford University, Parks Road, Oxford, OX1 3PW, United Kingdom, (7)Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, United Kingdom, (8)Evolution Applied Limited, 33 Gainsborough Drive, Sherborne, Dorset, DT9 6DS, United Kingdom, (9)Institute of Paleobiology, , Twarda 51/55, 00-818, Polish Academy of Sciences, Twarda 51/55, Warszawa, 00-818, Poland, (10)Earth and Planetary Sciences, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208, (11)MGPalaeo,, Unit 1/5, Arvida Street, Malaga, WA 6090, Australia, (12)Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637, (13)Institute of Geophysics, Czech Academy of Sciences, Praha, 141 31, Czech Republic, (14)Institute of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, Frankfurt, 60438, Germany, (15)Department of Geobiology, Geoscience Centre, Georg-August-Universität, Göttingen, 37077, Germany
The Salzgitter-Salder section, northern Germany, is the Global Boundary Stratotype Section (GSSP) for the base of the Coniacian Stage (Upper Cretaceous); it was ratified by the International Union of Geological Sciences on May 1
st, 2021. This succession, composed of uniform limestone / marly limestone / marl alternations, contains common to abundant critical groups of macrofossils (inoceramids) and microfossils (planktonic and benthic foraminifera, nannofossils and organic-walled dinoflagellate cysts), and a good and reliable carbon isotope signal. The integrated bio- and chemostratigraphic records derived from Salzgitter-Salder allow for well constrained long-distance correlations.
The base of the Coniacian Stage is defined by the first occurrence of the inoceramid Cremnoceramus deformis erectus (Meek), and is placed at the base of Bed 46. The first appearance of C. deformis erectus follows shortly after the first appearance of its evolutionary predecessor, C. waltersdorfensis waltersdorfensis, which marks the main turnover event in the evolutionary history of the clade around the base of the Coniacian.
In addition there are three auxiliary sections for the base of the Coniacian Stage, which are Słupia Nadbrzeżna (Poland), the Střeleč section (Bohemia), and the El Rosario section (Mexico).
The Słupia Nadbrzeżna section provides an excellent inoceramid record across the boundary interval, allowing for high-resolution correlation to the Salzgitter-Salder section, and demonstrates that the ammonite Forresteria (H.) petrocoriensis first enters the stratigraphic record in the upper Turonian. It additionally documents the latest Turonian lowest occurrence of the planktonic foraminifera Dicarinella concavata.
In Střeleč, the biostratigraphic and chemostratigraphic records are shown to be faithfully recorded in a depositional system influenced by substantial terrigenous clastic input.
The El Rosario section provides a rich record of the North American ammonite succession and demonstrates the presence and chronostratigraphic validity of most of the bio- and isotopic events recognized in Salzgitter-Salder also in North America. It documents the uppermost Turonian lowest occurrence of the planktonic foraminifera Dicarinella concavata; it shows that the LAD of Huberella huberi is distinctly younger than the basal Coniacian, and is at least as young as the base of the Forresteria (F.) allaudi ammonite Zone and a mid-level of the Cremnoceramus crassus inconstans inoceramid Zone.
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