Calibrating the Neogene of the Nordic Atlantic region
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Calibrating the Neogene of the Nordic Atlantic region
Erik Anthonissen
Ph.D. student, Natural History Museum, UiO
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NORLEX Neogene Lithostratigraphic Proposal
Approx. ageCentral
North Sea(UK sector)
Northern North Sea(NO sector)
Offshore Mid-Norway
Barents Sea
Pleistocene –
Pliocene
Naust Fm Naust Fm Naust Fm
Pliocene –
Miocene
Kai Fm,
Utsira Mbr
Kai Fm,
Molo Mbr
Miocene –
Oligocene
Lark Fm Lark Fm,
Skade Mbr
Brygge Fm
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Northern North Sea:
Naust FormationKai Formation with Utsira MemberLark Formation with Skade Member
Offshore Mid-Norway:
Naust FormationKai Formation with Molo MemberBrygge Formation
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Naust S+T
Naust U
Naust A
Naust N
Kai/Molo
Brygge
Lithostratigraphic architecture of offshore Mid-Norway
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Seismic section through the Utsira and Skade members(Rundberg & Eidvin, 2005)
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Lithostratigraphic unit Age (Ma) Biostrat. Calibration Reference
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/subfragoris 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, 644 + dinocysts.
Sr-isotopes:
10.3-11.7 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
= 13.65 Ma (Site 982) +
Sr-isotopes
Rundberg & Eidvin (2005); Flower (1999)
Hordaland
Group
Brygge Formation Top = ~18(Lower Miocene)
Base = Eoc.
C. cantharellum Zone, LO C. cantharellum
LO C. cantharellum = lower NN4 = 17.95 Ma
Powell (1992); Williams &
Manum (1999)
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Central and northern North Sea: Utsira and Skade members
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