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1 Calibrating the Neogene of the Nordic Atlantic region Erik Anthonissen Ph.D. student, Natural History Museum, UiO.

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Presentation on theme: "1 Calibrating the Neogene of the Nordic Atlantic region Erik Anthonissen Ph.D. student, Natural History Museum, UiO."— Presentation transcript:

1 1 Calibrating the Neogene of the Nordic Atlantic region Erik Anthonissen Ph.D. student, Natural History Museum, UiO

2 NORLEX Neogene Lithostratigraphic Proposal Approx. age Central North Sea (UK sector) Northern North Sea (NO sector) Offshore Mid-Norway Barents Sea Pleistocene – Pliocene Naust Fm Pliocene – Miocene Kai Fm, Utsira Mbr Kai Fm, Molo Mbr Miocene – Oligocene Lark FmLark Fm, Skade Mbr Brygge Fm

3 Northern North Sea: Naust Formation Kai Formation with Utsira Member Lark Formation with Skade Member Offshore Mid-Norway: Naust Formation Kai Formation with Molo Member Brygge Formation

4 Naust S+T Naust U Naust A Naust N Kai/Molo Brygge Lithostratigraphic architecture of offshore Mid-Norway

5 Seismic section through the Utsira and Skade members (Rundberg & Eidvin, 2005)

6 Lithostratigraphic unitAge (Ma)Biostrat.CalibrationReference Nordland Group Naust Formation < 2.75 (Upper Pliocene- Pleistocene) FCO I.R.D, C. grossa Zone 2.75 Ma = Expansion of Scandinavian ice-sheet Jansen & Sjøholm (1991); Eidvin et al. (2006) Kai Formation Top = > 2.3 Base = ~ 9-12 G. bulloides Zone – B. fragori/subfrago ris Zone ODP Site 642: LCO G. bulloides = 2.3 Ma; LO Bfra = LO R. pseudoumbilicus = 8.71 Spiegler & Jansen (1989); Eldholm et al. (1985) Molo Member Top = > 2.3 Base = ~ 9 (Upper Miocene- Lower Pliocene) Uppermost N. atlantica (s) Zone - B. metzmacheri Zone LO NatS = 2.3 Ma (within C2r.2r in ODP Sites 981, 982, 644. LO Bmet = ~ 8 Ma (Site 982: just below FO D. surculus Flower (1998), Spiegler & Jansen (1989; Spiegler (1998) Utsira Member Top = 4.5 Base = 12 (Middle Miocene- Lower Pliocene) lower part of N. atlantica (s) Zone – top B. reticulata – badenensis Zone LO NatS = 2.3 Ma (within C2r.2r in ODP Sites 981, 982, dinocysts. Sr-isotopes: Ma Head et al. (2004); Piasecki et al. (2002); Rundberg & Eidvin (2005); Anthonissen (2003, unpub.) Westray Group Lark Formation Skade Member Top = 15.4 Base = 17 (Lower Miocene) Gr. ex. gr. praescitula- zealandica Zone LO Gp-z below LO S. heteromorphus = Ma (Site 982) + Sr-isotopes Rundberg & Eidvin (2005); Flower (1999) Hordaland Group Brygge FormationTop = ~18 (Lower Miocene) Base = Eoc. C. cantharellum Zone, LO C. cantharellum LO C. cantharellum = lower NN4 = Ma Powell (1992); Williams & Manum (1999)

7 Central and northern North Sea: Utsira and Skade members

8 Thank you for listening!


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