1 Chemostratigraphy and stratigraphic distribution of keeled planktonic 2 foraminifera in the Cenomanian of the North German Basin 3 4 Jochen Erbacher1, André Bornemann1, Maria Rose Petrizzo2 and Stefan Huck3 5 1 Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655 Hannover, Germany 6 (E-mail:
[email protected]) 7 1 Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655 Hannover, Germany 8 (E-mail:
[email protected]) 9 2 Dipartimento di Scienze della Terra „A. Desio“, Università degli Studi di Milano, via Mangiagalli 34, 10 20133 Milano, Italy (E-mail:
[email protected]) 11 3 Institut für Geologie, Leibniz Universität Hannover, Callinstraße 30, 30167 Hannover, Germany (E- 12 mail:
[email protected]) 13 14 15 Key Words: Planktonic Foraminifera, carbon isotope stratigraphy, Boreal Cretaceous, Lower 16 Saxony Basin, Germany 17 Schlüsselwörter: Planktonische Foraminiferen, Kohlenstoffisotopenstratigraphie, Boreale 18 Kreide, Niedersächsisches Becken, Wunstorf, Deutschland 19 20 Abstract 21 The record of keeled planktonic foraminifera during the Cenomanian in boreal epicontinental 22 basins is discontinuous. Micropalaeontologic and bulk carbonate carbon and oxygen isotope 23 investigations from two cores in the center of the North German Basin (NGB, Wunstorf, Lower 24 Saxony) showed keeled praeglobotruncanids and rotaliporids to exclusively appear during 25 three stratigraphic intervals of varying duration in the lower and middle Cenomanian. Our new 13 26 high-resolution carbon isotope (δ Ccarb) composite curve shows that keeled foraminifera are 27 absent during the Mid Cenomanian Event (MCE) I. In the aftermath of MCE I, keeled planktonic 28 foraminifera are present throughout. The data are correlated to previously published 29 sequence stratigraphic models for the NGB.