Jurassic dinoflagellate cyst biostratigraphy of the Danish Subbasin in relation to sequences in England and Poland; a preliminary review

Poulsen, Niels E.

doi:10.1016/0034-6667(92)90148-a

Cited by 26 publications

(27 citation statements)

References 8 publications

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“…The Middle Jurassic of the Danish Central Graben and the Danish Basin consists mainly of coarse-grained, non-marine strata deposited during the Aalenian-Bathonian regressive event, or is represented by hiatuses. It contains few stratigraphic levels with marine intercalations and dinoflagellate cysts from this part of the Middle Jurassic are extremely rare (for further discussion, see Poulsen 1992Poulsen , 1996. The dinoflagellate cyst ranges for the Middle Jurassic are therefore based on ranges determined from the United Kingdom.…”

Section: Geological Frameworkmentioning

confidence: 99%

“…Riding & Thomas (1992) and Riding & Ioannides (1996) outlined the history of study of Jurassic dinoflagellate cyst biostratigraphy. Poulsen (1991Poulsen ( , 1992Poulsen ( , 1993Poulsen ( , 1994aPoulsen ( , b, 1996Poulsen ( , 1998 demonstrated the utility of the British Jurassic dinoflagellate cyst zonations of Woollam & Riding (1983) and Riding & Thomas (1992) in Denmark and Poland.…”

Section: Geological Frameworkmentioning

confidence: 99%

“…The zonation presented herein (Table 1) is an integrated zonation for Denmark and the United Kingdom based on the zonations presented by Davey (1979Davey ( , 1982, Woollam & Riding (1983), Nøhr-Hansen (1986), Riding & Thomas (1988, 1992 and Poulsen (1991Poulsen ( , 1992Poulsen ( , 1994bPoulsen ( , 1996. The British and Danish zonations are in general identical, with the exception of certain new subzones and other emendations that resulted from simultaneous, independent revisions by Poulsen (1992) and Riding & Thomas (1992); these differences are integrated and standardised here. Only the necessary emendations and other pertinent comments for unifying the British and Danish zonations are given below.…”

Section: Stratigraphic Palynologymentioning

confidence: 99%

“…This paper attempts a further integration and standardisation of the Jurassic dinoflagellate cyst zonation schemes established for the British and Danish areas ( Fig. 1; Davey 1979Davey , 1982Woollam & Riding 1983;Nøhr-Hansen 1986;Riding & Thomas 1988, 1992Poulsen 1991Poulsen , 1992Poulsen , 1994aKoppelhus & Nielsen 1994). In addition, the relationships between the zonation and palaeoecology are discussed, particularly with respect to the appearance and disappearance of species in relation to changes in sea level and palaeotemperature.…”

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The Jurassic dinoflagellate cyst zonation of Subboreal Northwest Europe

Poulsen

Riding

2003

GEUS Bulletin

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With an appendix by Bjørn Buchardt: Oxygen isotope palaeotemperatures from the Jurassic in Northwest EuropeThe Jurassic dinoflagellate cyst zonation for the British-Danish area is revised and discussed in relation to palaeoenvironmental factors, in particular, eustatic changes and fluctuations in palaeotemperature. The stepwise evolution of dinoflagellate cyst assemblages as defined by inceptions and apparent extinctions was largely controlled by sea-level change, particularly during intervals with significant short-term eustatic fluctuations. During times characterised by less pronounced, or longer term, sea-level change, fluctuations in oceanic palaeotemperatures appear to have influenced dinoflagellate evolution. Differences in the ranges of certain taxa between Denmark and the United Kingdom may be partly related to differences in palaeotemperature.

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Section: Geological Frameworkmentioning

confidence: 99%

Section: Geological Frameworkmentioning

confidence: 99%

Section: Stratigraphic Palynologymentioning

confidence: 99%

mentioning

confidence: 99%

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The Jurassic dinoflagellate cyst zonation of Subboreal Northwest Europe

Poulsen

Riding

2003

GEUS Bulletin

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“…This mainly based on species of the dinoflagellate cyst genera Luehndea and Nannoceratopsis. The Jurassic dinoflagellate cyst biozonation for northwest Europe was developed by Woollam and Riding (1983), Prauss (1989), FeistBurkhardt andWille (1992), Poulsen (1992), Riding and Thomas (1992) and Poulsen and Riding (2003). The latter zonal scheme can be applied to the the Réka Valley section, where two dinoflagellate cyst zones can be distinguished.…”

Section: Palynostratigraphymentioning

confidence: 99%

Multiphase response of palynomorphs to the Toarcian Oceanic Anoxic Event (Early Jurassic) in the Réka Valley section, Hungary

Baranyi

Pálfy

Görög

et al. 2016

Review of Palaeobotany and Palynology

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Major palaeoenvironmental and palaeoceanographical changes occurred during the Early Jurassic Toarcian Oceanic Anoxic Event (T-OAE), due to a perturbation of the global carbon cycle and a crisis in marine ecosystems. The sequence of environmental change and regional differences during the T-OAE are not yet fully understood and organic-walled phytoplankton and other palynomorphs are well-suited, but under-utilised, in research into this event. Based on quantitative palynological analyses from a black shale-bearing succession at Réka Valley in the Mecsek Mountains of southwest Hungary, five sequential palynomorph assemblages are distinguished. These reveal major shifts in organic-walled phytoplankton communities, driven by palaeoenvironmental changes. In addition, palynofacies analysis helped to document changes in the composition of sedimentary organic matter, and to quantify the terrestrial input. Assemblage 1 is characterised by a moderately diverse phytoplankton community and high levels of terrestrial palynomorphs. Assemblage 2 records a significant peak of the euryhaline dinoflagellate cyst Nannoceratopsis. Assemblage 3 is distinguished by dominance of highly opportunistic prasinophytes and the temporary disappearance of all dinoflagellate cyst taxa. Assemblages 4 and 5 represent distinctive phases of a prolonged recovery phase with low diversity phytoplankton assemblages and intermittently high levels of terrestrially-derived palynomorphs. The successive disappearance of phytoplankton taxa and the gradual takeover by opportunistic euryhaline species at the onset of the T-OAE were related to several phenomena. These include reduced salinity in the surface waters, establishment of a stable pycnocline and deterioration of nutrient recycling, followed by oxygen deficiency throughout much of the water column. The high amount of terrestrially-derived palynodebris indicates intense runoff and freshwater input, driven by the early Toarcian warming and the enhanced hydrological cycle. Comparison with coeval European successions proves that the palaeoenvironmental changes during the T-OAE were not entirely synchronous, and local factors played a crucial role in influencing phytoplankton communities. In the Mecsek Basin, regional freshening of the surface waters and increased terrestrial input due to the proximity of the hinterland had a greater influence on phytoplankton communities compared to the open oceanic setting of the Tethys to the south.

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The oldest stage of the Outer Carpathian evolution in the light of Oxfordian–Kimmeridgian exotic clast studies (southern Poland)

Kowal-Kasprzyk

Krajewski

Gedl

2020

Facies

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In the Late Jurassic, the rifting process led to the disintegration of the southern margin of the North European Platform and to the opening of the Outer Carpathian flysch basin sedimentary system. The initial sediments accumulated in the northern part of the basin are related to both the destruction and resedimentation of older platform deposits. Since the sedimentary succession of this pre-flysch phase was consumed by the Miocene subduction, its only traces are represented, nowadays, by clasts preserved as exotics in the succeeding flysch deposits. Our analysis of foraminifers as well as calcareous and organic dinoflagellate cysts found in these exotics confirms the Oxfordian-early Kimmeridgian timing of the platform phase that preceded the opening of the flysch basin. The exotics are represented by three main facies types: sponge-microbial limestones, oncoid-intraclastic-Crescentiella limestones and fine-grained, biodetrital limestones with Saccocoma. These deposits are related to mid-ramp to outer-ramp settings. The land influence was rather weak, and these sedimentary settings were dominated by pelagic/hemipelagic accumulation. The studied facies are similar to facies types widely distributed over the northern shelf area of the Western Tethys (e.g., extra-Carpathian southern Poland, Carpathian Foredeep basement, southern Germany). In turn, coeval strata known from the part of the Magura Basin and of the Penninic-Pieninic Ocean, which were situated in more southern part of the Tethys, yielded different microfacies reflecting significant differences between the sedimentary settings of the study area and its southern extensions.

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Jurassic dinoflagellate cyst biostratigraphy of the Danish Subbasin in relation to sequences in England and Poland; a preliminary review

Cited by 26 publications

References 8 publications

The Jurassic dinoflagellate cyst zonation of Subboreal Northwest Europe

The Jurassic dinoflagellate cyst zonation of Subboreal Northwest Europe

Multiphase response of palynomorphs to the Toarcian Oceanic Anoxic Event (Early Jurassic) in the Réka Valley section, Hungary

The oldest stage of the Outer Carpathian evolution in the light of Oxfordian–Kimmeridgian exotic clast studies (southern Poland)

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