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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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