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Calibrating the Neogene of the Nordic Atlantic region
Erik Anthonissen
Ph.D. student, Natural History Museum, UiO
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
Northern North Sea:
Naust FormationKai Formation with Utsira MemberLark Formation with Skade Member
Offshore Mid-Norway:
Naust FormationKai Formation with Molo MemberBrygge Formation
Naust S+T
Naust U
Naust A
Naust N
Kai/Molo
Brygge
Lithostratigraphic architecture of offshore Mid-Norway
Seismic section through the Utsira and Skade members(Rundberg & Eidvin, 2005)
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)
Central and northern North Sea: Utsira and Skade members
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