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No. 5, The Jurassic of North-East Greenland


Lars Stemmerik and Svend Stouge

Eastwards-dipping Middle-Upper Jurassic sandstones and interbedded marine mudstones at the base of the coastal cliffs along the south-east coast of Traill Ø
Eastwards-dipping Middle-Upper Jurassic sandstones (yellow) and interbedded marine mudstones (dark) at the base of the coastal cliffs along the south-east coast of Traill Ø. The Jurassic succession is described by Vosgerau et al. (this volume). It is disconformably overlain by poorly exposed Cretaceous siltstones with numerous volcanic intrusions that form ledges towards the top of the c. 1050 m high cliff. Photo: Lars Stemmerik.

Abstracts

map Preface
Stemmerik, L. & Stouge, S. (eds) 2004: The Jurassic of North-East Greenland. Geological Survey of Denmark and Greenland Bulletin 5, 112 pp.

The Jurassic sedimentary succession in East and North-East Greenland reflects deposition during the early stages of rifting between Greenland and Norway. Jurassic sediments are exposed over a distance of more than 600 km, from Jameson Land in the south to Store Koldewey in the north, and form one of the best-known exposed ancient rift successions. The sediments have been intensely studied over the last 25 years and a synthesis of the Jurassic System in Greenland was recently given in Geological Survey of Denmark and Greenland Bulletin 1 (Surlyk 2003).

This collection of papers deals with stratigraphic and depositional aspects of the Middle-Upper Jurassic sediments from isolated and less well-known localities outside the main outcrop areas, and thus adds to the tremendous amount of new data generated from the classical Jurassic successions of Jameson Land and the Wollaston Forland area (Ineson & Surlyk 2003). Most papers are based on fieldwork in 1996 and 1997, carried out within the framework of the project 'Resources of the sedimentary basins of North and East Greenland' supported by the Danish Research Councils (see Stemmerik et al. 1997). Papers dealing with the Jurassic at Store Koldewey and Hochstetter Forland are based on material collected during regional mapping in 1989 (Stemmerik & Piasecki 1990).

During Middle-Late Jurassic times, rifting took place along major N-S-trending synthetic faults that delimited wide westwards-tilted fault blocks (Surlyk 1977, 2003). This resulted in the development of elongated marine embayments with major rivers entering from the north and dominantly axial sediment transport towards the south (Surlyk 1978, 2003; Engkilde & Surlyk 2003). The Jurassic syn-rift succession on south-eastern Traill Ø is an exception to this general pattern (Vosgerau et al. 2004a, this volume). Sedimentation took place on an eastwards-tilted fault block; the succession shows an eastwards proximal-distal decrease in sandstone-mudstone ratio, reflecting increasing water depths to the east. On the adjacent fault block to the west, a new lithostratigraphic unit, the Bristol Elv Formation, has been erected to describe a succession of fluvio-lacustrine sediments at the base of the Middle Jurassic rift succession (Therkelsen & Surlyk 2004, this volume). The non-marine succession is overlain by shallow marine sandstones of the Pelion Formation (Upper Bajocian), succeeded in turn by 25-30 m of black silty mudstones of the Fossilbjerget Formation (Alsen & Surlyk 2004, this volume). The presence of the Fossilbjerget Formation on southern Traill Ø indicates complete drowning of the sandy Pelion system during maximum Middle Jurassic transgression (Alsen & Surlyk 2004, this volume).

A new Middle-Upper Jurassic succession was found in the hangingwalls of small fault blocks at Hold with Hope during fieldwork in 1996 (Stemmerik et al. 1997). The up to 360 m thick succession and its stratigraphy are described in detail by Vosgerau et al. (2004b, this volume) and Piasecki et al. (2004a, this volume). The succession resembles that seen at Wollaston Forland and Kuhn Ø. The Hold with Hope area was flooded during late Middle Jurassic time; Lower-Middle Callovian shallow marine sandstones of the Pelion Formation overlie Lower Triassic sediments (Vosgerau et al. 2004b, this volume). The overlying sandstones of the Payer Dal Formation are of Middle-Late Oxfordian age. The uppermost part of the succession belongs to the Bernbjerg Formation. The youngest sediments are of Late Oxfordian - Early Kimmeridgian age based on dinoflagellate cysts (Piasecki et al. 2004a, this volume). Dinoflagellate cysts have also been used to date the scattered outcrops of Middle-Upper Jurassic sediments at Hochstetter Forland and Store Koldewey further to the north (Piasecki & Stemmerik 2004, this volume; Piasecki et al. 2004b, this volume). The dinoflagellate cyst assemblages of these northern outliers are readily correlated to assemblages described from the Middle-Upper Jurassic further to the south in East Greenland, and also show some resemblance to assemblages described from North Greenland (Piasecki et al. 2004b, this volume).

References

Alsen, P. & Surlyk, F. 2004: Maximum Middle Jurassic transgression in East Greenland: evidence from new ammonite finds, Bjørnedal, Traill Ø. In: Stemmerik, L. & Stouge, S. (eds): The Jurassic of North-East Greenland. Geological Survey of Denmark and Greenland Bulletin 5 , 31-49 Read abstract

Engkilde, M. & Surlyk, F. 2003: Shallow marine syn-rift sedimentation: Middle Jurassic Pelion Formation, Jameson Land, East Greenland. In: Ineson, J.R. & Surlyk, F. (eds): The Jurassic of Denmark and Greenland. Geological Survey of Denmark and Greenland Bulletin 1 , 813-863. Ineson, J.R. & Surlyk, F. 2003: The Jurassic of Denmark and Greenland. Geological Survey of Denmark and Greenland Bulletin 1, 948 pp.

Piasecki, S. & Stemmerik, L. 2004: Jurassic dinoflagellate cysts from Hochstetter Forland, North-East Greenland. In: Stemmerik, L. & Stouge, S. (eds): The Jurassic of North-East Greenland. Geological Survey of Denmark and Greenland Bulletin 5 , 89-97 Read abstract

Piasecki, S., Callomon, J.H. & Stemmerik, L. 2004a: Jurassic dinoflagellate cyst stratigraphy of Store Koldewey, North-East Greenland. In: Stemmerik, L. & Stouge, S. (eds): The Jurassic of North-East Greenland. Geological Survey of Denmark and Greenland Bulletin 5 , 73-88 Read abstract

Piasecki, S., Larsen, M., Therkelsen, J. & Vosgerau, H. 2004b: Jurassic dinoflagellate cyst stratigraphy of Hold with Hope, North-East Greenland. In: Stemmerik, L. & Stouge, S. (eds): The Jurassic of North-East Greenland. Geological Survey of Denmark and Greenland Bulletin 5 , 99-112 Read abstract

Stemmerik, L. & Piasecki, S. 1990: Post-Caledonian sediments in North-East Greenland between 76° and 78°30'N. Rapport Grønlands Geologiske Undersøgelse 148 , 123-126.

Stemmerik, L., Clausen, O.R., Korstgård, J., Larsen, M., Piasecki, S., Seidler, L., Surlyk, F. & Therkelsen, J. 1997: Petroleum geological investigations in East Greenland: project 'Resources of the sedimentary basins of North and East Greenland'. Geology of Greenland Survey Bulletin 176 , 29-38.

Surlyk, F. 1977: Stratigraphy, tectonics and palaeogeography of the Jurassic sediments of the areas north of Kong Oscars Fjord, East Greenland. Bulletin Grønlands Geologiske Undersøgelse 123 , 56 pp. Surlyk, F. 1978: Jurassic basin evolution of East Greenland. Nature 274(5667), 130-133.

Surlyk, F. 2003: The Jurassic of East Greenland: a sedimentary record of thermal subsidence, onset and culmination of rifting. In: Ineson, J.R. & Surlyk, F. (eds): The Jurassic of Denmark and Greenland. Geological Survey of Denmark and Greenland Bulletin 1 , 659-722.

Therkelsen, J. & Surlyk, F. 2004: The fluviatile Bristol Elv Formation, a new Middle Jurassic lithostratigraphical unit from Traill Ø, North-East Greenland. In: Stemmerik, L. & Stouge, S. (eds): The Jurassic of North-East Greenland. Geological Survey of Denmark and Greenland Bulletin 5 , 19-29 Read abstract

Vosgerau, H., Alsen, P., Carr, I.D., Therkelsen, J., Stemmerik, L. & Surlyk, F. 2004a: Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland. In: Stemmerik, L. & Stouge, S. (eds): The Jurassic of North-East Greenland. Geological Survey of Denmark and Greenland Bulletin 5 , 9-18 Read abstract

Vosgerau, H., Larsen, M., Piasecki, S. & Therkelsen, J. 2004b: A new Middle-Upper Jurassic succession of Hold with Hope, North-East Greenland. In: Stemmerik, L. & Stouge, S. (eds): The Jurassic of North-East Greenland. Geological Survey of Denmark and Greenland Bulletin 5 , 51-71 Read abstract

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Abstracts:


References

Jurassic syn-rift sedimentation on a seawards-tilted fault block, Traill Ø, North-East Greenland

Henrik Vosgerau, Peter Alsen, Ian D. Carr, Jens Therkelsen, Lars Stemmerik and Finn Surlyk

Middle-Late Jurassic rifting in East Greenland was marked by westwards tilting of wide fault blocks bounded by major N-S-trending east-dipping synthetic faults. The syn-rift successions thicken westwards towards the faults and shallow marine sandstones show mainly southwards axial transport directions. An exception to this general pattern is found in south-east Traill Ø, which constitutes the E-tilted Bjørnedal Block, which is bounded to the west by the westwards-dipping antithetic Vælddal Fault. The stratigraphic development of the Jurassic succession on this block shows important differences to the adjacent areas reflecting a different tectonic development. Shallow marine sand seems initially to have filled accommodation space of the immedi-ately adjacent block to the west. This block subsequently acted as a bypass area and much of the sediment was spilled eastwards onto the hangingwall of the east-dipping Bjørnedal Block. The succession on the Bjørnedal Block shows an eastwards proximal-distal decrease in sandstone- mudstone ratio, reflecting increasing water depth and progressive under-filling of the subbasin towards the east in agreement with the dip direction of the fault block. The transverse, mainly south-eastwards palaeocurrents, the eastwards increase in water depths and decrease in sand-stone- mudstone ratio on the Bjørnedal Block are at variance with the standard picture of west-tilted blocks with southwards-directed palaeocurrents and decrease in grain size. Earlier palaeogeographic reconstructions have to be modified to account for the east-dipping hanging-wall and different stratigraphic development of the area. The sea was thus open towards the east and there is no direct indication of a barrier or shoal east of Traill Ø.

Keywords: Bjørnedal Block, Jurassic, North-East Greenland, palaeocurrents, rifting, Traill Ø

H.V.*, J.T.** & L.S., Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Present addresses: *Roskilde Amt, Køgevej 80, DK-4000 Roskilde, Denmark.
Skude & Jacobsen, Næstvedvej 1, DK-4760 Vordingborg.
P.A. & F.S., Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark. E-mail: petera@geol.ku.dk
I.D.C., Oxford Brookes University, Headington, Oxford OX3 0BP, UK.

Geological Survey of Denmark and Greenland Bulletin 5, 9-18 © GEUS, 2004


References

The fluviatile Bristol Elv Formation, a new Middle Jurassic lithostratigraphic unit from Traill Ø, North-East Greenland

Jens Therkelsen and Finn Surlyk

A new lithostratigraphic unit, the Bristol Elv Formation, is erected in this paper. It is only known from Traill Ø, East Greenland, where it unconformably overlies Triassic redbeds of the Fleming Fjord Formation and is overlain by lithologically similar shallow marine Upper Bajocian sand-stones of the Pelion Formation. The age of the formation is not well constrained but is probably Early Bajocian. The Bristol Elv Formation is at least 155 m thick and consists of conglomerates, coarse-grained pebbly sandstones and subordinate mudstones, deposited in braided rivers. A finer-grained lacustrine/floodplain unit, c. 37 m thick, is interbedded with the fluvial sandstones at one locality. Deposition of the fluvio-lacustrine Bristol Elv Formation marks a major change in basin configuration and drainage patterns, reflecting the onset of the important, protracted Mid-dle- Late Jurassic rift event in East Greenland.

Keywords: fluvial, lacustrine, Middle Jurassic sediments, new formation, North-East Greenland

J.T., Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.
Present address: Skude & Jacobsen, Næstvedvej 1, DK-4760 Vordingborg, Denmark. E-mail: JTH@sjas.dk
F.S., Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark.

Geological Survey of Denmark and Greenland Bulletin 5, 19-29 © GEUS, 2004


References

Maximum Middle Jurassic transgression in East Greenland: evidence from new ammonite finds, Bjørnedal, Traill Ø

Peter Alsen and Finn Surlyk

With an appendix by John H. Callomon: Description of a new species of ammonite, Kepplerites tenuifasciculatus n. sp., from the Middle Jurassic, Lower Callovian of East Greenland

A Middle - lower Upper Jurassic sandstone-dominated succession, more than 550 m thick, with mudstone intercalations in the middle part is exposed in Bjørnedal on Traill Ø, North-East Green-land. A number of ammonite assemblages have been found, mainly in the mudstones. They indicate the presence of the Lower Callovian Cadoceras apertum and C. nordenskjoeldi Chrono-zones. The mudstones represent northern wedges of the Fossilbjerget Formation hitherto known only from Jameson Land to the south. In Bjørnedal they interfinger with sandstones of the Pelion and Olympen Formations. The presence of the Fossilbjerget Formation in this region indicates complete drowning of the Middle Jurassic sandstone-dominated Pelion Formation during maxi-mum Middle Jurassic transgression. A new species, Kepplerites tenuifasciculatu s, is described in the appendix by J.H. Callomon. The holotype and paratype are from Jameson Land, East Greenland, but the species is also found in Bjørnedal, Traill Ø, North-East Greenland.

Keywords: ammonites, Fossilbjerget Formation, Middle Jurassic, Kepplerites tenuifasciculatus Callomon, Pelion Formation

Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark. E-mail: petera@geol.ku.dk

Geological Survey of Denmark and Greenland Bulletin 5, 31-49 © GEUS, 2004


References

A new Middle-Upper Jurassic succession on Hold with Hope, North-East Greenland

Henrik Vosgerau, Michael Larsen, Stefan Piasecki and Jens Therkelsen

A succession of marine, Jurassic sediments was recently discovered on Hold with Hope, North-East Greenland. The discovery shows that the area was covered by the sea during Middle-Late Jurassic transgressive events and thus adds to the understanding of the palaeogeography of the area. The Jurassic succession on northern Hold with Hope is exposed in the hangingwalls of small fault blocks formed by rifting in Late Jurassic - Early Cretaceous times. It unconformably overlies Lower Triassic siltstones and sandstones and is overlain by Lower Cretaceous coarse-grained sandstones with an angular unconformity. The succession is up to 360 m thick and includes sandstones of the Lower-Upper Callovian Pelion and Middle-Upper Oxfordian Payer Dal Formations (Vardekløft Group) and heteroliths and mudstones of the Upper Oxfordian - Lower Kimmeridgian Bernbjerg Formation (Hall Bredning Group). The Pelion Formation in-cludes the new Spath Plateau Member (defined herein). The palaeogeographic setting was a narrow rift-controlled embayment along the western margin of the rifted Jurassic seaway between Greenland and Norway. It was open to marine circulation to the south as indicated by the distribution and lateral facies variations and a domi-nant south-westwards marine palaeocurrent direction. The Pelion and Payer Dal Formations represent upper shoreface and tidally influenced delta deposits formed by the migration of dunes in distributary channels and mouthbars over the delta front. The boundary between the two formations is unconformable and represents a Late Callovian - Middle Oxfordian hiatus. It is interpreted to have formed by subaerial erosion related to a sea-level fall combined with minor tilting of fault blocks and erosion of uplifted block crests. In Late Jurassic time, the sand-rich depositional systems of the Pelion and Payer Dal Forma-tions drowned and offshore transition - lower shoreface heteroliths and offshore mudstones of the Bernbjerg Formation accumulated. The fault block crest forming the eastern basin margin was inundated by a rise in relative sea level. Major fault activity probably occurred in latest Jurassic - Early Cretaceous times when the major fault block originally defining the Hold with Hope basin was split into smaller blocks.

Keywords: Hall Bredning Group, Hold with Hope, lithostratigraphy, North-East Greenland, palaeogeography, sedimentology, shallow marine, Spath Plateau Member, Vardekløft Group

H.V.*, M.L., S.P. & J.T.** , Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark. E-mail: mil@geus.dk
Present addresses: *Roskilde Amt, Køgevej 80, DK-4000 Roskilde, Denmark.
Skude & Jacobsen, Næstvedvej 1, DK-4760 Vordingborg, Denmark.

Geological Survey of Denmark and Greenland Bulletin 5, 51-71 © GEUS, 2004


References

Jurassic dinoflagellate cyst stratigraphy of Hold with Hope, North-East Greenland

Stefan Piasecki, Michael Larsen, Jens Therkelsen and Henrik Vosgerau

Dinoflagellate cysts of the Middle-Upper Jurassic succession on northern Hold with Hope have been studied in order to establish a biostratigraphic framework and to date the succession. The Pelion Formation is characterised by abundant Chytroeisphaeridia hyalina and Sentusidinium

spp., with some Ctenidodinium thulium and Paragonyaulacysta retiphragmata in the lower part. Mendicodinium groenlandicum appears higher in the formation followed by Trichodinium scarburghense in the upper part. The succeeding Payer Dal Formation contains Scriniodinium crystallinu m, Rigaudella aemula and Leptodinium subtile in the lower part and Dingodinium jurassicum and Prolixosphaeridium granulosum in the uppermost part. The Bernbjerg Forma-tion contains abundant Sirmiodinium grossii and Gonyaulacysta jurassic a. Adnatospahaeridium sp., Cribroperidinium granuligerum Glossodinium cf. dimorphum and Scriniodinium irregulare appear in the lower part of the formation, followed by Avellodinium spp. in the highest part. The dinoflagellate cyst assemblages in the Pelion Formation indicate an Early-Late Callovian age (C. apertum - P. athleta Chronozones). This is supported by ammonites in the lower part of the formation, which refer to the C. apertum and P. koenigi Chronozones. A significant hiatus, from Late Callovian to Middle Oxfordian, is present between the Pelion Formation and the overlying Payer Dal Formation. The age of the Payer Dal Formation is Middle Oxfordian to earliest Late Oxfordian (C. tenuiserratum - A. glosense Chronozones). The Payer Dal Formation is conform-ably overlain by the Bernbjerg Formation of Late Oxfordian to possibly earliest Kimmeridgian age (A. glosense - P. baylei Chronozones). The A. glosense Chronozone is also documented by abundant ammonites in the lowermost part of the formation.

Keywords: ammonites, dinoflagellate cysts, Jurassic, North-East Greenland, stratigraphy

S.P., M.L., J.T.* & H.V.** , Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark. E-mail: sp@geus.dk
Present addresses: *Skude & Jacobsen, Næstvedvej 1, DK-4760 Vordingborg, Denmark.
Roskilde Amt, Køgevej 80, DK-4000 Roskilde, Denmark.

Geological Survey of Denmark and Greenland Bulletin 5, 73-88 © GEUS, 2004


References

Jurassic dinoflagellate cysts from Hochstetter Forland, North-East Greenland

Stefan Piasecki and Lars Stemmerik

Three sections in Hochstetter Forland, North-East Greenland, referred to the Jurassic Payer Dal and Bernbjerg Formations, have been analysed for dinoflagellate cysts. The dinoflagellate cysts, new finds of ammonites and previously recorded marine faunas form the basis for improved dating of the succession. The basal strata of the Payer Dal Formation at Kulhus is here dated as Late Callovian, Peltoceras athleta Chronozone, based on the presence of relatively abundant Limbicysta bjaerke i, Mendicodinium groenlandicu m, Rhychoniopsis cladophora and Tubotu-berella dangeardii in an otherwise poor Upper Callovian dinoflagellate assemblage. Ammonites have not been recorded from these strata. The upper Payer Dal Formation at Agnetesøelven is dated as Late Oxfordian, Amoeboceras glosense Amoeboceras serratum Chronozones, based on the presence of Sciniodinium crystallinu m, together with Cribroperidinium granuligera and Stephanelytron sp. The age is in accordance with ammonites present in the uppermost part of the formation at Søndre Muslingebjerg. New ammonites in the Bernbjerg Formation at Agnetesøelven together with dinoflagellate cysts indicate an earliest Kimmeridgian age, Rasenia cymodoce and Aulacostephanoides mutabilis Chronozones. The Upper Callovian dinoflagellate cysts from Hochstetter Forland belong to a local brackish to marginal marine assemblage, which only allows a fairly broad correlation to coeval assem-blages in central East Greenland. In contrast, the Oxfordian and Kimmeridgian assemblages are fully marine and can be correlated from Milne Land in central East Greenland via Hochstetter Forland to Peary Land in eastern North Greenland.

Keywords: ammonites, Boreal, dinoflagellate cysts, Hochstetter Forland, Jurassic, North-East Greenland

Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark. E-mail: sp@geus.dk

Geological Survey of Denmark and Greenland Bulletin 5, 89-97 © GEUS, 2004


References

Jurassic dinoflagellate cyst stratigraphy of Store Koldewey, North-East Greenland

Stefan Piasecki, John H. Callomon and Lars Stemmerik

The Jurassic of Store Koldewey comprises a Middle Jurassic succession towards the south and an Upper Jurassic succession towards the north. Both successions onlap crystalline basement and coarse sediments dominate. Three main lithostratigraphical units are recognised: the Pelion For-mation, including the Spath Plateau Member, the Payer Dal Formation and the Bernbjerg Forma-tion. Rich marine macrofaunas include Boreal ammonites and the successions are dated as Late Bathonian - Early Callovian and Late Oxfordian - Early Kimmeridgian on the basis of new collections combined with material in earlier collections. Fine-grained horizons and units have been analysed for dinoflagellate cysts and the stratigraphy of the diverse and well-preserved flora has been integrated with the Boreal ammonite stratigraphy. The dinoflagellate floras corre-late with contemporaneous floras from Milne Land, Jameson Land and Hold with Hope farther to the south in East Greenland, and with Peary Land in North Greenland and Svalbard towards the north. The Middle Jurassic flora shows local variations in East Greenland whereas the Upper Jurassic flora gradually changes northwards in East Greenland. A Boreal flora occurs in Peary Land and Svalbard. The characteristic and stratigraphically important species Perisseiasphaeridium pannosum and Oligosphaeridium patulum have their northernmost occurrence on Store Kolde-wey, whereas Taeniophora iunctispina and Adnatosphaeridium sp. extend as far north as Peary Land. Assemblages of dinoflagellate cysts are used to characterise significant regional flooding events and extensive sequence stratigraphic units.

Keywords: ammonites, Boreal, dinoflagellate cysts, Jurassic, North-East Greenland, Store Koldewey

S.P. & L.S., Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark. E-mail: sp@geus.dk
J.H.C., Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK.

Geological Survey of Denmark and Greenland Bulletin 5, 99-112 © GEUS, 2004


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